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Song of the Younger World - S2-E20
Factual error: It's the 1800s, but Amy's skirt has a 20th Century zipper running down the back. (00:05:15)
Trivia: It's a blink-and-you'll-miss-it in-joke: When the Wrights get trapped in time, they briefly take refuge in a movie theater sporting one-sheet posters for the film Time Bandits.. (00:07:40)