
Matt Selman, executive producer of the Simpsons pointed out a big error in the 13th episode of season 6. In fact, in the episode And Maggie Makes Three, which aired for the first time in January 1995, Marge announces to Homer that she is pregnant with Maggie. However, just behind the couple, a portrait of the little girl is already hanging on the wall of their dining room.
Read more at The Simpsons : The error that no one has noticed for the past 23 years
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