Other mistake: Maureen cuts her wrists with a razor blade. Days later, no bandages or scars.
Audio problem: Although the protagonists are all American, the actors are all English. This is why several characters mysteriously switch accents part of the way through the film - Marty speaks with a solid English accent after his first few lines.
Continuity mistake: The amount of roaches in the bowl at the bar changes from less to more.
Continuity mistake: Torok the Troll wears a magic silver ring which allows him to appear in the form of Wendy Potter. However after Wendy's mother tells her about the orange juice, when Wendy touches the cold bottle of milk in the fridge she grabs her arm in pain and we can see both of her hands, and she's not wearing that magic ring.
Revealing mistake: When the bully's held up by Sam wires can be faintly seen.
