1) “A defender wearing spiked gauntlets can't be disarmed.” Taking the Rules As Written literally here would imply that spiked gauntlets prevents someone from disarming any of your weapons.
2) “A creature can’t hide within 60 feet of a character with darkvision unless it is invisible or has cover.” RAW implies that a dwarf cannot hide within 60’ of himself
3) “Evasion can be used only if the rogue is wearing light armor or no armor.” RAW implies that a rogue cannot use a ring of evasion while in armor, even though other PC’s can.
4) "Speed while wearing elven chain is 30 feet for Medium creatures, or 20 feet for Small." RAW implies that elven chain would make Dwarves go faster, but Barbarians, Monks, Flyers, etc. would go slower.
5) "When the character finally fails her Constitution check, she begins to drown. In the first round, she falls unconscious (0 hp). " Taken literally, this could allow someone below 0 hp to have their hp increased when drowning.
6) "Suffocation: A character who has no air to breathe can hold her breath for 2 rounds per point of Constitution. " Strictly as written, the suffocation rules would technically apply to non-breathing creatures.
7) "a hasted creature may make one extra attack with any weapon he is holding". As written; natural attacks, unarmed strikes, armor spikes and animated shield bashes cannot benefit from haste’s extra attack.
8) "If people are observing you, even casually, you can’t hide. ". So a rogue could not hide from the enemies while being observed by his allies.
9) Strictly by RAW, a monk is not given proficiency with unarmed strikes (i.e. a monk does not have proficiency with simple weapons, which unarmed strike is).
10) The jump skill description says "Long Jump: A long jump is a horizontal jump, made across a gap like a chasm or stream. ", so one could not long jump over something that is not a gap.
11) Although ranged attacks are listed as provoking AoO’s in the Standard Actions table, full attacks (included ranged full attacks) do not provoke according to the Full-round actions table.
12) No rule says you’re prone when you lose consciousness.