Continuity mistake: After Paulie is bought from the pawn shop by Ruby, they are out on the sidewalk talking and if you watch in the background, the same red Mustang turns the corner twice in a row.
Continuity mistake: In the marching band scene they all have long shadows, and then suddenly they have no shadows at all.
Revealing mistake: When the dog with its legs in plaster is walking across the passageway the first time you see it its back legs are moving although they're supposed to be crippled.
Continuity mistake: After Marnie has installed the talisman, we are given a glimpse of her where she is flipped. She had been resting on the giant pumpkin with her right leg hiked up and her right foot resting inside the pumpkin's left eye. But she is flipped, with her left leg hiked up and her left foot resting in the pumpkin's right eye.
Continuity mistake: Madame Blueberry's hair changes from brown to blonde throughout the film.
Suggested correction: Her hairstyle and hat change. She bought a wig and a new hat while at StuffMart, and continues wearing them until the final scene, where she is back to being herself.
Visible crew/equipment: Just before Johnathan Taylor Thomas climbs into the fake Santa's sleigh to sleep for the night, he is talking to Santa and playing with his hand. On his lower chest is the shadow of the camera (since the light is coming from behind the camera), which disappears in the following angle.
Continuity mistake: When the girl in the orange slides over the stones and then falls to the ground tumbling over and over, you can see that her arms are completely protected by black arm protectors, yet when she comes to a complete stop, they are now missing.
Continuity mistake: When Thang and Rose approach Sal after searching the tunnels, the wide shot shows a large purple mushroom behind him to his left. Later on in the scene, after Gigi leaves, Thang tells him he's gotta be more careful, and it has disappeared. (00:08:25 - 00:09:25)
Other mistake: During the intro, the Poet (voiced by the author of the original book, Luis Sepúlveda) is frying a couple of eggs. When he does his dramatic rendition though, he moves the frying pan in ways that would certainly spill its content. (00:01:20)