Continuity mistake: When the guy and girl are sitting in the car, they put the newspaper with duct tape up on the window but later on both the duct tape and newspaper are gone.
Continuity mistake: When Fred gets to the North Pole and the Security elves take him down. Fred comes up and the snow on his face change between shots.
Factual error: Trudie and her family are released from jail because David, being the victim of kidnapping, decided not to press charges. That's not how things work. It's not up to the victim to decide whether or not to press charges. It's up to the prosecutor to decide or not to press charges.
Factual error: When Tom shocks Angela with a stun gun, she gets knocked out. That's impossible. Stun guns don't knock you out. Stun guns don't cause unconsciousness.