Continuity mistake: A doctor comes into a patient's room. The door swings inward to the right, and it has a heavy lock on it. When she leaves she closes the door. It swings inward, but to the left, and it has no heavy lock. (00:04:10 - 00:08:25)
Other mistake: In the credits of the movie, the creator of the original comic's name is misspelled as "Bob Macleod" when it should read "Bob McLeod."
Continuity mistake: Danielle is running and slams into a force field. She gets a bloody nose. Then she runs back to attack Illyana, and falls when Illyana disappears. She looks up, and her nose in not bloody any more. (00:13:25 - 00:14:20)