They Saved Lisa's Brain/References

Cultural references

 * The title of this episode is a reference to the sci-fi movie .
 * Homer Simpson mistakes Stephen Hawking for, the founder of , who has been confined to a wheelchair since an assassination attempt.

Trivia

 * In the scene, Mayor Quimby can be seen in the stands, even though he earlier fled Springfield thinking MENSA had heard of his corruption.
 * This episode reveals that Carl may have diabetes.

Continuity

 * This is the second time Bart rides an animal naked, the first being "And Maggie Makes Three", as seen in a photo album.

Goofs

 * The "learned council" says that it would be better if dogs at the dog track chased a diploma instead of a rabbit. Dogs are motivated by a sense of smell, not sight. Most dogs pay no attention to an artificial rabbit. They have to be trained to do so through a conditioned response. Dog owners often train dogs to chase an electric rabbit by attaching kitten or rabbit meat to it and convincing the dog to tear it to shreds. This has been one of the biggest factors of animal abuse in the United States.
 * When Marge copied something that was on the screen of Stephen Hawking's machine, Stephen Hawking said, "You copied that off my screen". But he was talking when something else was still on his screen.
 * When Homer looks through the dictionary he turns a lot of pages, yet only makes it to letter B. He then doesn't turn much pages and ends up on P. He turns back a few pages and is back on B.