Scooby-Doo and the Witch's Ghost

Audio problem: When people waited for the ghost and left, Velma says, "Let's give it a chance, Ben." But Daphne's lips are moving.

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Continuity mistake: When they go to the famous writer's hometown, the mayor is taller than the writer then later he is shorter than him.

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Question: If the opening villains were part of Ben's plot, why did they seem mad at him?

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