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- When Arnold and Grandma first enter the rock garden room, only Grandma leaves foot prints. In all subsequent scenes neither disturb the sand.
- When the tenants and the gang are waiting outside the garage for Arnold's demonstration, Oskar's hair and beard are gray.
- The bus stops in front of the boarding house, but there's no bus stop there.
- At the end of the first training scene when Arnold first tries to catch the fly, one of Arnold's feet has no toes.
- Just before Arnold falls down the chimney, he has three arms.
- Caesar looks different from his other appearances because his unibrow is missing.