Does he remember all the littlle things?

Sometimes he does, sometimes he doesn't. It depends on how much he likes her, and also who else he might like, if he is single and looking. For me, sometimes it seems like I remember the smallest things about a girl I like even to the point of creepiness, but then on some bigger things, I need to ask about them again. And it varies from guy to guy. One might remember every word, while another might just remember how the conversation made him feel when it was over. There isn't really a yes or no answer to this question, but from my experience, I've found that guys usually remember some of the little details when they're crushing on a girl.

Maybe, but I don't think guys attach such important feelings to these events. There may be certain events that trigger feelings or memories for him, but generally a guy won't have cataloged the sequence of events in his brain.

If you find a guy is paying you a lot of attention and is remembering these things then it's a sure fire sign that he's trying to impress you and that he would like to get together.