Continuity mistake: When Cratchett gets the bird from the shop, it's clear that the bird is a duck. But throughout the entire film he's referred to as a goose.
Continuity mistake: When Kris gives the children toys, one of them says, "What about the Meisterburger?" Kris than says, "What about him? I'll save him a big red yo-yo!" and pulls out a red yo-yo. However, when he hands it to the Meisterburger, it is not red, but is yellow and has blue and red stripes.