Sara's hat has a red stain on the left side while at the tree lot. By the time they take their walk into town, the stain has disappeared.
A Canadian mailbox is visible behind the characters on a sidewalk that is supposedly in Washington State; the film was shot in British Columbia, Canada.
While Sara and Peter are bidding goodbye to his aunt and mother after purchasing Christmas trees, Sara has her handbag and then doesn't, several times. Obvious editing mistake that happened about 4 times.