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Pooh's Double Trouble / Eeyore Sleeps on It - S1-E19
Factual error: The letters and symbols on the characters' reflections in the mirror look like their regular counterparts, when they're supposed to be in reverse.
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Interview with a Platypus/Tip of the Day - S2-E7
Factual error: When they exit the London Eye, it stops. In real life, it does not.