Continuity mistake: Jake is opening Ian's locker, with Ian inside. He asks the third number of the combination; depending on the shot, he's holding the lock with both hands, or he has one hand on the door itself. (00:03:10)
Continuity mistake: Near the end, Jake hides in a dog crate. The dog runs out of the plane, and the baggage guys chase after it. While this is happening, a bag is coming down the conveyor belt. Between the first shot and the next angle, the bag jumps backwards.
Factual error: Eddie drops Jake off near Madison, Wisconsin after he realises Jake just wants Allie back. Minutes before this, the background in the vehicle shots shown is in the mountains. Wisconsin, especially that part of the state, doesn't have mountains. Nearly the entire film was shot in British Columbia.
Visible crew/equipment: Just before Johnathan Taylor Thomas climbs into the fake Santa's sleigh to sleep for the night, he is talking to Santa and playing with his hand. On his lower chest is the shadow of the camera (since the light is coming from behind the camera), which disappears in the following angle.
Factual error: After the group of ladies drop Jake off, he's seen at the on-ramp of "I-15 east" trying to hitch a ride. I-15 is a North / South interstate. While portions go east / West, its on-ramps are still labeled as North or South.
Continuity mistake: When Jake is holding onto the roof of the vehicle, he sees a toddler in the back seat. When the vehicle makes a turn and Jake falls off, the toddler isn't in the back seat.