Forgetting things he's said and done has caused other characters to react badly to his - when they do, he's utterly mystified. "Why doesn't [character's name] like [my character]?" When I've told him, he's been floored. "[My character] did that? When?" Additionally, his forgetting information makes it hard for me to advance the plot at times, considering his character has sometimes been the only one with a particular piece of information that he didn't get around to sharing with the rest of the group before he forgot about it.
He doesn't pick up on subtle clues, so I don't know if IC solutions would work too well - he might even think I was picking on him.
I *have* tried to encourage him to take notes, but the results of this have been mixed - he either ends up using outdated information (we've been playing for a bit over a year, and his notes aren't terribly organized), or just doesn't refer to the notes at all, which puts things pretty much back at square one.
Advice? (Someone in another community actually suggested I punch him in the face every time he forgets something, but that seems a little extreme....:)