This errata list for Steam & Steel was kindly compiled by John Cooper. I hope you find it useful! Some of these are minor rules errors, although most are just spelling errors.
p. 1, Table of Contents, 1st column: "Alchemists Hound" should be "Alchemist's Hound" (need an apostrophe)
p. 1, Table of Contents, 2nd column: Alphabetically, "Steel Sentinel" should be moved to immediately after "Steamwork Lich."
p. 2, 1st sentence: "and exciting new mixture" should be "an exciting new mixture"
p. 4, 1st new paragraph, 3rd sentence: "leakage's" should just be "leakages" (no apostrophe)
p. 11, "Steamworks Domain," first spell listed: "Magic Co8g" should be "Magic Cog"
p. 13, 2nd column, "The Empire of Hurdell," 2nd sentence: "Advances in the design or skycraft" should be "Advances in the design of skycraft"
p. 14, 1st column, 2nd new paragraph, 1st sentence: "a period if high steampower" should be "a period of high steampower"
p. 14, same sentence as above: "if the culture" should be "of the culture"
p. 21, 2nd column: The "Creating Steamwork Devices" box should come at the end of the italicized example, not in the middle of it.
p. 23, 1st column, "Alchemechanic" feat, Prerequisites: Currently, "Craft (Steamworks)," is repeated twice in a row - delete one of them.
p. 25, 2nd column, "Super-Heavy Armour Proficiency" feat: There should be a blank line above this feat to separate it from the "Steam Surgeon" feat.
p. 31, 2nd column, 1st new paragraph, 1st sentence: "fire to hear the boiler" should be "fire to heat the boiler"
p. 41, Chart: "Climbers Companion" should be "Climber's Companion" (need an apostrophe)
p. 44, 1st column: "Climbers Companion" should be "Climber's Companion" (need an apostrophe)
p. 44, 2nd column, "Cloud Dust" entry, 3rd sentence: "/2" should be "1/2"
p. 45, 1st column, "Farsight Lens" entry: Need a blank line above "Farsight Lens [Arcana]" to separate it from the "Erudite Matrix" paragraph.
p. 46, 1st column, last word: "PHB" should probably be "Core Rulebook I"
p. 47, 1st column, "Mechanical Lockpick" entry, last sentence: "Pick Locks checks" should be "Open Lock checks"
p. 49, 2nd column, 4th line: "victims body" should be "victim's body" (need an apostrophe)
p. 49, 2nd column, "Predator Matrix" entry, last sentence: "Wilderness Lore checks" should be "Survival checks"
p. 50, 2nd column, "Saboteur's Tools" entry, 2nd sentence: "make up a saboteurs tools" should be "make up a saboteur's tools" (need an apostrophe)
p. 52, 2nd column, 1st line: "f7orce" should be "force"
p. 56, 2nd column, "Chain-tooth Blade" entry, 3rd sentence: "out of harms way" should be "out of harm's way" (need an apostrophe)
p. 58, 1st column, "Piston Fold-Up" entry, 2nd sentence: "/4" should be "1/4"
p. 62, 1st column, 1st new paragraph, 3rd sentence: Need a period at the end of the sentence, after "60%"
p. 62, 1st column, 1st new paragraph, 5th sentence: "it's own mechanisms" should be "its own mechanisms" (no apostrophe needed)
p. 63, 1st column, "Powered Spikes" entry: Need a blank line above "Powered Spikes [Steamwork]" to separate it from the "Integrated Shield" paragraph above.
p. 63, 1st column, "Smoked Lenses" entry: Need a blank line above "Smoked Lenses" to separate it from the "Sealed Environment, Enhanced" paragraph above.
p. 68, 2nd column, "Necromek Crypt Factory" entry, last sentence: "wizards armies" should be "wizard's armies" (need an apostrophe)
p. 70, 1st column, 2nd new sentence: "1 /2 hours" should be "1 1/2 hours"
p. 76, 1st column, "Iron Throat" entry, 1st sentence: "characters throat" should be "character's throat" (need an apostrophe)
p. 80, 2nd column, very bottom: "The PC's Are Special" should be "The PCs Are Special" (no apostrophe needed)
p. 81, 1st column, 1st paragraph, last sentence: "NPC's who have need of" should be "NPCs who have need of" (no apostrophe needed)
p. 83, 2nd column, "Automaton, Steamwork," Challenge Rating: "/2" should be "1/2"
p. 84, 1st column, "Large Automaton," "AC" listing: AC should be 20, not 19. Also, flat-footed AC should be 20, not 19.
p. 84, 2nd column, "Colossal Automaton," "Hit Dice" listing: Hit points should be 256, not 252.
p. 85, 1st column, "Maintenance" paragraph: "Maintenance DC's" should be "Maintenance DCs" (no apostrophe needed)
p. 85, 1st column, "Behemoth" stats: Damage should be 4d6+67, not 4d6+45.
p. 85, 1st column, "Behemoth," "Space/Reach" entry: Remove the extra space before "40ft."
p. 87, 1st column, last paragraph, 3rd sentence: "flying assaults and man weapons" should be "flying assaults and man-made weapons" (or possibly "flying assaults and ranged weapons" instead?)
p. 88, 2nd column, "Living Steel," "Attacks" line: Remove one "+" from "++7"
p. 89, 2nd column, "Iron Juggernaut," "Attacks" line: Slam attacks and weapon attacks should be at +16/+11 melee, not +18/+13 melee. Likewise, ranged attacks should be at +6/+1 ranged, not +8/+3 ranged.
p. 89, 2nd column, "Iron Juggernaut," "Damage" line: Slam damage should be 2d6+13, not 2d6+9.
p. 90, 2nd column, "Iron Shroud," "Hit Dice" line: "7d12" should be "7d12+3" (due to the Toughness feat)
p. 90, 2nd column, "Iron Shroud," "Attacks" line: Slam should be at +8 melee, not +9 melee.
p. 90, 2nd column, "Iron Shroud," "Damage" line : "1d8+6" should be "1d8+9"
p. 91, 2nd column, "Manservant," "CR" line: "/2" should be "1/2"
p. 92, 1st column, "Mechanised Creature" template, last paragraph: note that the template can only be applied to corporeal creatures.
p. 92, 2nd column, "Scorpion Sentinel," "Hit Dice" line: Hit points should be 107, not 113.
p. 92, 2nd column, "Scorpion Sentinel," "Space/Reach" line: Delete the extra space before the second "10ft"
p. 93, 1st column, "Barbed Bolts" paragraph, 1st sentence: Reflex save DC should be 18, not 16.
p. 94, 1st column, "Siege Sentinel," "Attacks" line: Delete extra space between the "+" and the "11"
p. 94, 1st column, "Siege Sentinel," "Damage" line: Delete the extra space between the "1d8+" and the "7"
p. 94, 1st column, "Siege Sentinel," "Saves" line: No saves are given; they should be Fort +3, Ref +3, Will +5.
p. 94, 2nd column, "Slaughterer," "Hit Dice" line: Hit points should be 79, not 81.
p. 94, 2nd column, "Slaughterer," "Attacks" line: Should read "4 claws +12/+7 melee".
p. 94, 2nd column, "Slaughterer," "Damage" line: Should read "Claw 1d8+10"
p. 94, 2nd column, "Slaughterer," "Saves" line: No saves given; they should be Fort +3, Ref +7, Will +5.
p. 95, 1st column, "Poison" paragraph, last sentence: "d3 strength" should be "1d3 Strength"
p. 95, 1st column, "Poison" paragraph: Fort DC should be 14, not 12.
p. 96, "Steel Sentinel" entry in its entirety: Alphabetically, this should appear after the "Steamwork Lich" template.
p. 96, 1st column, "Steel Sentinel," "Attacks" line: Melee attacks should both be at +11, not +12.
p. 96, 1st column, "Steel Sentinel," "Damage" line: "1d8+7" should be "1d8+10"
p. 96, 1st column, "Steel Sentinel," "Space/Reach" line: Delete the extra space before the second "10ft"
p. 96, 2nd column, "Stalker," "Attack" line: Delete the extra space between the "+" and the "6"
p. 96, 2nd column, "Stalker," "Damage" line: "1d4+3" should be "1d4+4"
p. 96, 2nd column, "Stalker," "Feats" line: Alphabetically, "Dodge*" should come before "Improved Initiative"
p. 97, 2nd column, "Steam Wurm," "Attacks" line: "+18/13" should be "+18/+13"
p. 97, 2nd column, "Steam Wurm," "Advancement" line: "13-24 HD" should be "14-24 HD"
p. 98. 1st column, "Steam Blast" paragraph: Reflex save DC should be 15, not 16.
p. 98, 2nd column, "Constructing a Steam Wurm" section: The spell "plane shift" should be a prerequisite.
p. 99, 1st column, "Steam Spirit," "Damage" line: "d6+4" should be "1d6+6"
p. 99, 2nd column, "Steamwork Creature" template, 2nd paragraph: It should be noted that this template can only be applied to a corporeal creature.
p. 99, 2nd column, last paragraph ("Hit Dice"): "d10's" should be "d10s" (no apostrophe required)
pp. 99-100, "Hit Dice" paragraph: It should be noted that a Steamwork Creature of Small or larger size gains size-based bonus hit points by having the construct creature type.
p.100, 2nd column, "Steamwork Lich," 2nd paragraph, 2nd sentence: Delete the word "like" from the phrase "make the lich look like as skeletal as possible"
p. 101, 1st column, "Animal" paragraph, 1st sentence: "the hides of beers or bulls" should be "the hides of bears or bulls"
p. 101, 2nd column, last paragraph, 2nd sentence: "the normal liches phylactery" should be "the normal lich's phylactery" (needs an apostrophe)
p. 102, 1st column, "Zealot," "Attacks" line: Delete the extra spaces before the "+7" in both cases.
p. 102, 1st column, "Zealot," "Damage" line: "1d8+7" should be "1d8+10"
p. 103, 2nd column, "Arcane Warding" section, last sentence: "IT" should be "It" (the "t" should be lower case)
p. 109, 1st column, last paragraph, 4th sentence: "The impact inflict s24 damage to the dragon" should be "The impact inflicts 24 points of damage to the dragon"
p. 110, 2nd column, "Ironclad," "AC" line: AC should be 24, not 25.
p. 110, 2nd column, "Sample Ironclad" section, 1st paragraph, last sentence: "it's own offensive capabilities" should be "its own offensive capabilities" (no apostrophe needed)
p. 111, 1st column, "Steam Wagon," 1st paragraph, 2nd sentence: "btoh" should be "both"
p. 111, 1st column, last line: The entire line should be in bold font.
p. 111, 2nd column, "Submersible," "Hit Dice" line: Hit points should be 122, not 128.
p. 111, 2nd column, "Submersible," "AC" line: Add a space between the "25" and the parentheses
p. 112, 2nd column, "Tunneller," "Speed" line: Technically, that should be "Burrow 30 ft," not "Tunnel 30ft"
p. 113, 2nd column, "Prerequisites," "Special" line: "at least 6 months experience" should be "at least 6 months' experience" (or optionally, "at least 6 months of experience")
p. 124, 2nd column, "Materials & Craftsmanship" paragraph, 1st sentence: "rion" should be "iron"
p. 124, 2nd column, "Edifices of Might" paragraph, 1st sentence: "bledn" should be "blend"
p. 125, 1st column, "Prestige Classes" paragraph, last sentence: "the lizardfolks church" should be "the lizardfolk's church"
p. 1, Table of Contents, 1st column: "Alchemists Hound" should be "Alchemist's Hound" (need an apostrophe)
p. 1, Table of Contents, 2nd column: Alphabetically, "Steel Sentinel" should be moved to immediately after "Steamwork Lich."
p. 2, 1st sentence: "and exciting new mixture" should be "an exciting new mixture"
p. 4, 1st new paragraph, 3rd sentence: "leakage's" should just be "leakages" (no apostrophe)
p. 11, "Steamworks Domain," first spell listed: "Magic Co8g" should be "Magic Cog"
p. 13, 2nd column, "The Empire of Hurdell," 2nd sentence: "Advances in the design or skycraft" should be "Advances in the design of skycraft"
p. 14, 1st column, 2nd new paragraph, 1st sentence: "a period if high steampower" should be "a period of high steampower"
p. 14, same sentence as above: "if the culture" should be "of the culture"
p. 21, 2nd column: The "Creating Steamwork Devices" box should come at the end of the italicized example, not in the middle of it.
p. 23, 1st column, "Alchemechanic" feat, Prerequisites: Currently, "Craft (Steamworks)," is repeated twice in a row - delete one of them.
p. 25, 2nd column, "Super-Heavy Armour Proficiency" feat: There should be a blank line above this feat to separate it from the "Steam Surgeon" feat.
p. 31, 2nd column, 1st new paragraph, 1st sentence: "fire to hear the boiler" should be "fire to heat the boiler"
p. 41, Chart: "Climbers Companion" should be "Climber's Companion" (need an apostrophe)
p. 44, 1st column: "Climbers Companion" should be "Climber's Companion" (need an apostrophe)
p. 44, 2nd column, "Cloud Dust" entry, 3rd sentence: "/2" should be "1/2"
p. 45, 1st column, "Farsight Lens" entry: Need a blank line above "Farsight Lens [Arcana]" to separate it from the "Erudite Matrix" paragraph.
p. 46, 1st column, last word: "PHB" should probably be "Core Rulebook I"
p. 47, 1st column, "Mechanical Lockpick" entry, last sentence: "Pick Locks checks" should be "Open Lock checks"
p. 49, 2nd column, 4th line: "victims body" should be "victim's body" (need an apostrophe)
p. 49, 2nd column, "Predator Matrix" entry, last sentence: "Wilderness Lore checks" should be "Survival checks"
p. 50, 2nd column, "Saboteur's Tools" entry, 2nd sentence: "make up a saboteurs tools" should be "make up a saboteur's tools" (need an apostrophe)
p. 52, 2nd column, 1st line: "f7orce" should be "force"
p. 56, 2nd column, "Chain-tooth Blade" entry, 3rd sentence: "out of harms way" should be "out of harm's way" (need an apostrophe)
p. 58, 1st column, "Piston Fold-Up" entry, 2nd sentence: "/4" should be "1/4"
p. 62, 1st column, 1st new paragraph, 3rd sentence: Need a period at the end of the sentence, after "60%"
p. 62, 1st column, 1st new paragraph, 5th sentence: "it's own mechanisms" should be "its own mechanisms" (no apostrophe needed)
p. 63, 1st column, "Powered Spikes" entry: Need a blank line above "Powered Spikes [Steamwork]" to separate it from the "Integrated Shield" paragraph above.
p. 63, 1st column, "Smoked Lenses" entry: Need a blank line above "Smoked Lenses" to separate it from the "Sealed Environment, Enhanced" paragraph above.
p. 68, 2nd column, "Necromek Crypt Factory" entry, last sentence: "wizards armies" should be "wizard's armies" (need an apostrophe)
p. 70, 1st column, 2nd new sentence: "1 /2 hours" should be "1 1/2 hours"
p. 76, 1st column, "Iron Throat" entry, 1st sentence: "characters throat" should be "character's throat" (need an apostrophe)
p. 80, 2nd column, very bottom: "The PC's Are Special" should be "The PCs Are Special" (no apostrophe needed)
p. 81, 1st column, 1st paragraph, last sentence: "NPC's who have need of" should be "NPCs who have need of" (no apostrophe needed)
p. 83, 2nd column, "Automaton, Steamwork," Challenge Rating: "/2" should be "1/2"
p. 84, 1st column, "Large Automaton," "AC" listing: AC should be 20, not 19. Also, flat-footed AC should be 20, not 19.
p. 84, 2nd column, "Colossal Automaton," "Hit Dice" listing: Hit points should be 256, not 252.
p. 85, 1st column, "Maintenance" paragraph: "Maintenance DC's" should be "Maintenance DCs" (no apostrophe needed)
p. 85, 1st column, "Behemoth" stats: Damage should be 4d6+67, not 4d6+45.
p. 85, 1st column, "Behemoth," "Space/Reach" entry: Remove the extra space before "40ft."
p. 87, 1st column, last paragraph, 3rd sentence: "flying assaults and man weapons" should be "flying assaults and man-made weapons" (or possibly "flying assaults and ranged weapons" instead?)
p. 88, 2nd column, "Living Steel," "Attacks" line: Remove one "+" from "++7"
p. 89, 2nd column, "Iron Juggernaut," "Attacks" line: Slam attacks and weapon attacks should be at +16/+11 melee, not +18/+13 melee. Likewise, ranged attacks should be at +6/+1 ranged, not +8/+3 ranged.
p. 89, 2nd column, "Iron Juggernaut," "Damage" line: Slam damage should be 2d6+13, not 2d6+9.
p. 90, 2nd column, "Iron Shroud," "Hit Dice" line: "7d12" should be "7d12+3" (due to the Toughness feat)
p. 90, 2nd column, "Iron Shroud," "Attacks" line: Slam should be at +8 melee, not +9 melee.
p. 90, 2nd column, "Iron Shroud," "Damage" line : "1d8+6" should be "1d8+9"
p. 91, 2nd column, "Manservant," "CR" line: "/2" should be "1/2"
p. 92, 1st column, "Mechanised Creature" template, last paragraph: note that the template can only be applied to corporeal creatures.
p. 92, 2nd column, "Scorpion Sentinel," "Hit Dice" line: Hit points should be 107, not 113.
p. 92, 2nd column, "Scorpion Sentinel," "Space/Reach" line: Delete the extra space before the second "10ft"
p. 93, 1st column, "Barbed Bolts" paragraph, 1st sentence: Reflex save DC should be 18, not 16.
p. 94, 1st column, "Siege Sentinel," "Attacks" line: Delete extra space between the "+" and the "11"
p. 94, 1st column, "Siege Sentinel," "Damage" line: Delete the extra space between the "1d8+" and the "7"
p. 94, 1st column, "Siege Sentinel," "Saves" line: No saves are given; they should be Fort +3, Ref +3, Will +5.
p. 94, 2nd column, "Slaughterer," "Hit Dice" line: Hit points should be 79, not 81.
p. 94, 2nd column, "Slaughterer," "Attacks" line: Should read "4 claws +12/+7 melee".
p. 94, 2nd column, "Slaughterer," "Damage" line: Should read "Claw 1d8+10"
p. 94, 2nd column, "Slaughterer," "Saves" line: No saves given; they should be Fort +3, Ref +7, Will +5.
p. 95, 1st column, "Poison" paragraph, last sentence: "d3 strength" should be "1d3 Strength"
p. 95, 1st column, "Poison" paragraph: Fort DC should be 14, not 12.
p. 96, "Steel Sentinel" entry in its entirety: Alphabetically, this should appear after the "Steamwork Lich" template.
p. 96, 1st column, "Steel Sentinel," "Attacks" line: Melee attacks should both be at +11, not +12.
p. 96, 1st column, "Steel Sentinel," "Damage" line: "1d8+7" should be "1d8+10"
p. 96, 1st column, "Steel Sentinel," "Space/Reach" line: Delete the extra space before the second "10ft"
p. 96, 2nd column, "Stalker," "Attack" line: Delete the extra space between the "+" and the "6"
p. 96, 2nd column, "Stalker," "Damage" line: "1d4+3" should be "1d4+4"
p. 96, 2nd column, "Stalker," "Feats" line: Alphabetically, "Dodge*" should come before "Improved Initiative"
p. 97, 2nd column, "Steam Wurm," "Attacks" line: "+18/13" should be "+18/+13"
p. 97, 2nd column, "Steam Wurm," "Advancement" line: "13-24 HD" should be "14-24 HD"
p. 98. 1st column, "Steam Blast" paragraph: Reflex save DC should be 15, not 16.
p. 98, 2nd column, "Constructing a Steam Wurm" section: The spell "plane shift" should be a prerequisite.
p. 99, 1st column, "Steam Spirit," "Damage" line: "d6+4" should be "1d6+6"
p. 99, 2nd column, "Steamwork Creature" template, 2nd paragraph: It should be noted that this template can only be applied to a corporeal creature.
p. 99, 2nd column, last paragraph ("Hit Dice"): "d10's" should be "d10s" (no apostrophe required)
pp. 99-100, "Hit Dice" paragraph: It should be noted that a Steamwork Creature of Small or larger size gains size-based bonus hit points by having the construct creature type.
p.100, 2nd column, "Steamwork Lich," 2nd paragraph, 2nd sentence: Delete the word "like" from the phrase "make the lich look like as skeletal as possible"
p. 101, 1st column, "Animal" paragraph, 1st sentence: "the hides of beers or bulls" should be "the hides of bears or bulls"
p. 101, 2nd column, last paragraph, 2nd sentence: "the normal liches phylactery" should be "the normal lich's phylactery" (needs an apostrophe)
p. 102, 1st column, "Zealot," "Attacks" line: Delete the extra spaces before the "+7" in both cases.
p. 102, 1st column, "Zealot," "Damage" line: "1d8+7" should be "1d8+10"
p. 103, 2nd column, "Arcane Warding" section, last sentence: "IT" should be "It" (the "t" should be lower case)
p. 109, 1st column, last paragraph, 4th sentence: "The impact inflict s24 damage to the dragon" should be "The impact inflicts 24 points of damage to the dragon"
p. 110, 2nd column, "Ironclad," "AC" line: AC should be 24, not 25.
p. 110, 2nd column, "Sample Ironclad" section, 1st paragraph, last sentence: "it's own offensive capabilities" should be "its own offensive capabilities" (no apostrophe needed)
p. 111, 1st column, "Steam Wagon," 1st paragraph, 2nd sentence: "btoh" should be "both"
p. 111, 1st column, last line: The entire line should be in bold font.
p. 111, 2nd column, "Submersible," "Hit Dice" line: Hit points should be 122, not 128.
p. 111, 2nd column, "Submersible," "AC" line: Add a space between the "25" and the parentheses
p. 112, 2nd column, "Tunneller," "Speed" line: Technically, that should be "Burrow 30 ft," not "Tunnel 30ft"
p. 113, 2nd column, "Prerequisites," "Special" line: "at least 6 months experience" should be "at least 6 months' experience" (or optionally, "at least 6 months of experience")
p. 124, 2nd column, "Materials & Craftsmanship" paragraph, 1st sentence: "rion" should be "iron"
p. 124, 2nd column, "Edifices of Might" paragraph, 1st sentence: "bledn" should be "blend"
p. 125, 1st column, "Prestige Classes" paragraph, last sentence: "the lizardfolks church" should be "the lizardfolk's church"
