Other mistake: Near the beginning, Scott and Charlie are flying in the sleigh down a road next to a truck. During the entire scene, the truck driver is constantly jerking the wheel to the right and left yet the truck remains in a perfectly straight course.
Other mistake: In the courtroom scene, the North Pole expert is an Air Force lieutenant colonel, Lt Col Coulson. In the credits, he is listed as Cmdr Coulson, a Navy rank.