Hiya!
You know the saying..."A picture is worth a thousand words"? Use that.

If a monster has SR, adopt a personal "symbol" you can use to remind your brain of it; say, a star with a pentagram in it. If an NPC has special range attack, use an arrow. If an area has some kind of fire hazard/trap, draw a little flame. Put these icons right next to the encounter number/name or in the 'margin' of your notes right next to it. Somewhere that isn't actually part of the description or stat block. Somewhere that your eye will be drawn to. If you can correlate the icon in your notes, and draw the same thing on the 'map' (if it's an encounter, for example), it helps you keep tabs on where certain NPC's/traps/etc are in the same way. You will see the PC's are in "room 14", and just down the hall is "room 15", and next to the "15" is a fire symbol...it will help you remember "Oh, right, this is where the fire elemental is guarding the Foozle of Might".
For added bonus...use colour too! Different coloured symbols can indicate certain things (red for "fire/heat/anger" or something that makes sense to you). You can have the same symbol mean slightly different things...so a red 'pentagram' symbol could mean "SR vs fire/heat", while a green one might indicate "Resistance to poison/disease".
^_^
Paul L. Ming