(For a little experiment, go back and try to re-read PoA without knowing that Black is innocent, Lupin is a werewolf who probably knows Occlumency, the Order of the Phoenix existed, James was a teenage asshole and that Snape was a Death Eater.)

Heh--I totally thought James being a teenage asshole *was* canon in PoA. I was surprised when I said something about it on FAP before OotP came out and it wasn't more widely thought. I thought Snape was a jerk too; I just thought the hints we got about MWPP in PoA, particularly when they were talking to Snape through the map, foreshadowed...exactly the guys we saw in the Pensieve.