Other mistake: When James Gandolfini hits Ben Affleck over the head with the shovel for burning something in his front yard, he falls, but his head never hits the ground. You can actually see Ben Affleck holding his head up a few inches off the ground. An impossible feat for someone who is supposed to be unconscious.
Other mistake: Rose's secretary tells her that Rose's sister couldn't spend Christmas with her. But in Rose's mother's hospital room, all of the childhood pictures she points out shows a girl and a boy, not two girls. One could claim that they also had a brother, and that there was never taken any photos of her sister, but since the whole story is about the fact that Rose doesn't have anyone to spend X-mas with, wouldn't she call her brother if she had one?
Other mistake: When they first arrive at the North Pole, one of the elves appears to be sliding along. His legs and arms are not moving, and his head is not bobbing up and down.
Other mistake: Nora spends a long time trying to get a Hickory Honey Ham (because it is Blairy's favorite). Finally, Marty brings one to the party. After Blair and Enrique arrive, Nora puts some ham on his plate, commenting yet again that it is Blairy's favorite. Yet when Luther goes across the street, he takes *them* the prized Hickory Honey Ham - still in the can.
Suggested correction: He carries Mel's brand ham across the street, not Honey Hickory Ham, to the neighbors. He even mentions it's made mostly of a gelatinous product.
But in the Supermarket the Honey Ham is a Mel's. There's a big sign in the store when the lady gets it before Nora.