Factual error: Finishing his rounds on the morning of Christmas Day, flying over downtown Chicago, the sun is over the horizon west of Chicago, Sunrises occur in the east, not the west. (00:26:10)
Factual error: Tim Allen drives a 1st generation Ford Taurus SHO (1989-91) in the movie, which was only available with a manual transmission. When he pulls up and parks at the Denny's, you can see his hand down on the console and the clicking sound of shifting an automatic from drive into park.
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.