Tidbits I particularly liked: Lucas having to train Shia LeLeouf in how to be a "greaser"; Spielberg invoking the Killer Rabbit; both of them geeking out over Cate Blanchett's villain character; and this comment from Lucas:
You do a whole lot of research around the subject matter to try to get it as plausible as possible. We don't deal with time machines. We don't deal with phony notebooks that don't exist. We don't deal with pyramids in 10,000 B.C., because there weren't any.