Continuity: When the bus starts to rock, just after Cartman has recalled the Fonzie story, the background turns from day to night in a split second.
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Quotes
Trey Parker: You know, when Comedy Central asked us to do a Thanksgiving episode, the first thought that went through my mind was, "Boy, I'd like to have sex with Jennifer Aniston."
Trivia
This episode aired the day "Cartman's Mom is Still a Dirty Slut" was supposed to air. Since it was April Fools Day, the creators decided to play a prank by airing this episode. This resulted in Comedy Central getting phone calls from angry viewers who hated how they had waited four weeks for the identity of Cartman's father to be revealed only to discover that they had to wait an additional three weeks for the actual episode. Consequently, this episode was shown again on Comedy Central only twice. The second being right before the release of the movie. See more...
Movie Mistakes blog
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15 Transformers mistake pictures
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starring Isaac Hayes, Matt Stone, Trey Parker (add more)
Updates: 
Series 7
City on the Edge of Forever (a.k.a. Flashbacks) (season 2, episode 7)
You may also like: Family Guy | Ghostbusters | The Dark Knight | Indiana Jones and the Kingdom of the Crystal Skull | Terminator Salvation
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