Dan, without doubt. He was the man that created GB, and i believe he would sit down and talk GB, at is, if he had time. i would figure he'd like prase from fans. i know i would (to a point, of course) i mean, if you talked to him about GB the whole conversation, then he would be a little annoyed. try to talk a little about other movies, ask a couple of questions, maybe even talk paranormal, SNL, things of that nature.
the second actor that would talk might would be Ernie, but i dont think he cares that much about it. hed give an autograph, talk about 5 minuets, but thatll be it.
Harold might talk for about 10 minuets about GB, but he might move along to other movies he acted in/directed. either that, he'll just ignore you. (not saying his a jag, though)
Bill, unlike the rest of them, is just an asshole. he doesnt care for the fact that he doesnt want to care. the only fans he has, are the ones that have enough respect for the guy, to pay money to watch his movies.