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- When Sid takes off his hat, his hair is stringy, but unlike his full head of hair in the episode "Heat".
- Pennies haven't been made with that much copper since 1982; now they are mostly zinc. However, copper pennies are now worth 2 cents more than their face value.
- When the police row Arnold and the gang back to the city, Brainy isn't on the rowboat.
- The credits say "Character & Prop Designers" though only one person is credited.