Audio problem: Throughout the entire film, many of the supporting characters are noticeably and distractingly overdubbed. It's often most noticeable with the police officer Jessica, who is one of the main characters. The movie was shot in Bulgaria primarily with European actors and had most of their dialogue replaced in post-production, presumably to cover up accents.
Revealing mistake: When the demon is dressed up as Santa Claus, watch closely. Every time you can see under his sleeves, you can see where the monster makeup on his arms ends, and the normal human skin behind it.
