In the episode where Stewie gets put into a foster home at the begining of the show, before the theme song is played, it shows Stewie sitting next to a stack of blocks that says "redrum" which is a reference to Stephens King's "The Shining."
As south Park pointed out several times in one particular episode, The Simpsons have done everything! I find it amazing that even The Simpsons havn't started to blatently repeat it's own plotlines in new episodes.
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