Continuity mistake: In the scene just before the snowman comes to life, the clock in the hallway reads midnight. But a little later, when he is showing the snowman around the house and he is about to lead him upstairs, the clock reads 8:05.
Continuity mistake: Baxter meets his neighbour for the first time as he is about to unlock the door. In the very first shot the doc lowers his arm, which is raised again in the close-up. (00:08:30)
Continuity mistake: Allie's brother asks their dad (who just finished pitching the "bones for bowsers dot com " idea to Sam) "How long are you gonna be gone this time." He raises and lowers the hands in the same shot, and in the next the hands are raised again. (00:03:15)