Audio problem: Near the end of the movie, when Leon Phelps is giving a speech to all his "victims", the camera starts to move up and over his head. If you keep your eye on Leon's mouth, it doesn't move for the last three or four words he says.
Continuity: In the scene where Julie is in the diner with Leon and she reads the letter that Leon got, the note reads 'I've never forgotten that fateful night.' But Julie says 'I still remember that fateful night.