What's your system?
I have ISTJ friend who who can walk into a room and pretty much remember every detail in the room.
ISTJs seem to be the best at trivia games, due to being able to remember every little fact they've come across (especially in spatial form). It doesn't seem to matter if they were interested in it or not.
They were also the first ones to point out that I am wearing my shirt backwards or inside out. (I did this more when I was younger).
So how do you do it?
How do you notice when even the slightest thing is out-of-place?