Yeah, but that's a major plot issue... Dobby sealing the entrance to Platform 9 3/4, them missing the train, using the flying car, Arthur's getting in trouble, the howler, Lockheart bugging Harry about fame (which would most likely happen anyway, but it is one time he does it)...
I really think it's something so tiny and minute we would have NO idea just watching it over and over again... that's what makes me think it's something seemingly stupid like Lockheart talking about being an honorary member of the dark force defense league or something like that...
or also, if you watch the deleted scenes, I wonder if it could be in there... I know, it's not "in the movie" but it's made available with the movie... like Filch doing the Kwikspell course (we do know an unlikely person will use magic... this taught us that there are supposedly ways to learn it even if you're not gifted, though it's mostly a sham)
and I'm going around in circles, cuz I have got NO IDEA what the little thing is....
