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Series 
Plot hole: In "Starship Poopers," Kang always wears a glass thing on his head, but whenever Homer beats him up, it's gone.
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Trivia
When Homer says to Lisa "How could they change my character from cool to stupid?" and Lisa replies "creators love to tinker with shows, they drop characters, change some and push others into the background", in the background walking past the window you can see Mr. Largo, The Capitol City Goofball and a few other long since backgrounded characters. See more...
The Simpsons (1989) - 2 mistakes in "Tree House of Horror IX"
Directed by Matt Groening, starring Dan Castellaneta, Hank Azaria, Harry Shearer, Julie Kavner, Kelsey Grammer, Nancy Cartwright, Phil Hartman, Yeardley Smith (add more)
Tree House of Horror IX (season 10, episode 4)
Audio problem: At the end when Bart says 'Don't forget Ken Star' his mouth doesn't move.
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