Those are my sentiments, exactly. It would be nice if they let one fan have an exclusive view of the movie to correct errors such as those. Who, but the fans, can notice when Harry's scar switches sides on his head, or any of the out of canons errors. They should seriously consider it. J.K. Rowling has said herself that occasionally she checks HP-Lexicon to make sure she's in canon. She was joking, but, seriously, the fans know their story.