When Santa jiggles the doorknob to try to get in, there is no lock on it.
Holly bends down to knock on the postal carrier's window even though he is driving a truck.
Cameraman reflected in van window during the final chase.
When Nick, Holly, and Emily are staying at Nick's uncle's house, they are supposed to be a mile from the next house but houses with the lights on can be seen behind Nick when he goes outside.