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- When Arnold rips off one of the boxtops, the box has a ragged edge which suddenly turns into a smooth edge.
- Arnold's shoes are black throughout the episode but in the in the scene where Arnold and Gerald are full from eating cereal, his shoes are white.
- When Gerald puts in the boxtops they disappear into the envelope.
- On Hulu, this episode is misspelled as "Salley's Comet", to match the spelling of Halley's Comet.