Visible crew/equipment: In the scene where Buddy and Michael are leaving the school, a crew member is visible in the bottom left of the shot. At first, he is just standing there, but he then tries to hide inside a doorway. (00:52:00)
Other mistake: In the end credits, Santa's name in the song title "Santa Claus is Comin' to Town" is misspelled as "Clause."
Visible crew/equipment: A stage light is reflected on Lou-Old boss' sunglasses.
Continuity mistake: When Lucy is in the Callaghan's house at Christmas at the very end of the scene it shows her stocking and her name on it is in white letters. However, in the scene where Mary comes in and tells the family that Lucy is pregnant, the camera pans to Jack who is standing right beside Lucy's stocking, only this time her name is in black letters.
Continuity mistake: The view out the back of the barn door when it's first revealed does not match the same view, just minutes later, in the final shot of the film. (01:55:43 - 01:59:12)
Visible crew/equipment: During the final song, while they're all at the dinner table, there's a crouching puppeteer with a blonde ponytail next to the rats.