Continuity mistake: Although Clara kicks her shoe at the Mouse King's head, when she gets down from the mantelpiece, it is back on her foot with no sign of her having retrieved it.
Continuity mistake: When Emily falls off the roof, one shot shows her falling with her back first and her legs together. Then the shot changes to her mom, and back to her, at which point her legs are further apart, she is angled more headfirst, and is still at the same height.
Other mistake: When showing "In Association with" in the English dub's credits, The Pokémon Company is misspelled as "The Pokeman Company." (01:15:37)
Continuity mistake: In the shot of everyone chanting, "disco ball!" Hermey is seen in the background, but two shots later, Hermey has disappeared. (00:19:00)
Continuity mistake: The arc-shaped garden plant directed the protagonist to someone who can help him. A nasty human armed with shears walks by and starts his torture; he kneels by the plant, in a zone with no shadows, and in the next shot the whole section of ground is in the shade. (00:39:40)