Continuity mistake: After the hot cocoa is spilled, the stains on Will Ferrell's shirt keep changing from shot to shot.
Factual error: The tubing scene was filmed at Nashoba Valley in Westford, MA. The scene looking down from the top of the tubing run has a banner with the name of the ski area and the "mountains" in the background scene are photoshopped in.
Factual error: The movie is set over Christmas, but Forsythia (bushes with yellow flowers) only bloom in the spring.
Revealing mistake: When Megan jumps on Santa's lap, the camera does a close-up of Megan and Santa. It looks like an earpiece is in her ear for people to feed her the script lines. (00:55:10)
Answer: "Do They Know It's Christmas?"
Bishop73