Movie?! What! Movies, as you may know, are often based on good books but ruined by bad acting, bad directing, deleted chapters, and other things. Take Harry Potter 3. It was still a good movie, but it could have been better and more consistent. Like, that hill at the bottom of which Hagrid's house was located? That wasn't in the books OR any of the preceding movies! And Harry's supposed to get his Firebolt before learnng the Patronus Charm, which is WAAAAY before the end!
Corn is no place for a mighty warrior!