Treehouse of Horror XX/References

Cultural references

 * The first segment is a pastiche of numerous films. The main plot derives from ', where two men plot to kill off each others' enemies, while other elements of ',  and other Hitchcock movies are included. Hitchcock himself is shown in a brief cameo stepping out of a bus (as he did in the title sequence of North By Northwest).
 * The second segment is a parody of both (a pandemic causes mankind to turn into zombie-like monsters) and (a society on the brink of collapse due to chaos has one chance of survival thanks to someone with a medical anomaly [in Children of Men, it was the last woman on Earth who is able to have a baby (as all the women in the world in Children of Men suffer from infertility); in Don't Have a Cow, Mankind, it's Bart's immunity from Krusty's latest burger]).
 * The third segment is a parody of.
 * If you look closely you can see that the theatre reads Madea Goes To Hell.
 * In the opening, the bullies are wearing costumes of John 117, The Joker and Venom.
 * The first segment title is a parody of "Dial M For Murder". The second segment title is a parody of Bart Simpson's catchphrase: "Don't have a cow, man". The third segment title is a parody of "There's No Business Like Show Business".

Goofs

 * In the second segment, when Bart and Homer initially step outside and Homer blows their cover, Kirk Van Houten is seen in the back right of the muncher mob breaking down the front door to try to get to the Simpsons. Yet, when they make it to the safe zone, Mr. Van Houten is clearly seen in the front of the crowd before the Simpsons push themselves through.  While it may be a goof, it could also be someone similar to him, though the physical features are astonishingly alike.
 * Ralph Wiggum is seen as a muncher eating his own arms. Yet he is seen happy and healthy at the end of the segment. Of course this could mean that Bart's immunity also doubles as a cure for the already infected. You can see Homer is still in his "muncher cage" behaving like a muncher.
 * In the first segment, Mrs. Krabappel goes into her apartment without unlocking her door.
 * After Homer becomes a muncher the gun turns into a single barrel.

Trivia

 * This is the first Treehouse of Horror since Treehouse of Horror X to air in October.
 * The segment, Don't Have a Cow Mankind, is the third time Springfield has been over run by zombies (the first two being Treehouse of Horror III and Treehouse of Horror XIII).
 * At the end of the second segment, Homer still hasn't been changed back to normal(Bart probably wanted Homer to stay that way.)
 * The Simpsons have a flat fullscreen television set in this episode.
 * The ending song is the first time the main theme has been used for a song sung by the Simpsons.
 * Ratings: 8.59 million viewers.
 * The coustumes the monsters from the opening segment wore were Frankenstein as SpongeBob, the Werewolf as Harry Potter, Mummy as Jack Sparrow, and the Vampire as Iron Man.