Audio problem: Outside the Miller's house the detective who was interrogating Scott is now shouting at the house with a bullhorn. When the detective lowers the bullhorn, his voice sounds like it is still being amplified.
Audio problem: When the cops stop the random Santa on the street thinking that he's Calvin, he says, "It's not even my suit! It's a rental!" But his lips are completely out of sync.
Audio problem: When the elf special forces are about to take off and the female elf does a somersault, the sound that is created when they touch their wrist console can be heard over the sounds of the jet pack take off sounds. No one is even touching their wrists during the scene. (01:19:27)
Chosen answer: Even though Charlie did not want to stay with his Dad for Christmas Eve, he did want to stay at home with a family member, fragmented as it was. Eating Christmas Eve dinner at a Denny's restaurant was not his idea of a Christmas dinner at home with family.