Continuity mistake: In the scene when Hermione punches Malfoy in the face, she holds her wand to his neck with her right hand. The shot changes to her turning away and then she punches him - both her hands appear in the shot and her wand is gone. In the next shot she mysteriously has her wand in her left hand with no time to have dropped it then picked it up again.
Mimichella
22nd Apr 2010