Revealing mistake: When they are inspecting the statues at the end of the movie, somebody touches one of them. It wobbles as if it was made of something else than stone.
Factual error: When they are driving to the Everglades for a picnic, the sea is at their left. As Xanadu and the Everglades are on the Gulf coast, the sea should be at their right.
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Suggested correction: That depends on which direction are you filming, north-south or vice versa.
