The Jetsons (1962)
0 other mistakes in show generally
Starring: Mel Blanc, Daws Butler, Janet Waldo, George O'Hanlon, Penny Singleton
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A Date with Jet Screamer - S1-E2
Other mistake: In the song "Eep Opp Ork Ah Ah" (sung later in the episode), the singer's lyrics say that it means "I love you", but it was first revealed by Elroy and his friend who first wrote that same code to mean "Meet me tonight".
George Jetson: Jane. Stop this crazy thing.