Treehouse of Horror XXI/References

Opening

 * The creature inside Professor Frink when he goes past the X-ray resembles an.
 * Frink has made his own.
 * The monster refers to , and the scene that immediately follows parodies the show's opening.
 * The first few frames of the opening credits are also done in the same style as The Office.

War and Pieces

 * The segment is a parody of .
 * Board games that come to life include:
 * Taffy Land
 * Drops and Risers
 * Consternation
 * Ravenous Ravenous Rhinos
 * Mouse Catch
 * Battleboat
 * Funopoly
 * Crate of Apes
 * Yahtzu
 * Tiddlywonks
 * Satan's Path
 * Spinning tops
 * Connect Three
 * Tumbling Game
 * Ice Hockey Game
 * -style blocks
 * Chess
 * Mystery Date
 * Milhouse's death scene is a parody of Jack Dawson's in the 1997 film .
 * Milhouse's death scene is a parody of Jack Dawson's in the 1997 film .
 * Milhouse's death scene is a parody of Jack Dawson's in the 1997 film .
 * Milhouse's death scene is a parody of Jack Dawson's in the 1997 film .
 * Milhouse's death scene is a parody of Jack Dawson's in the 1997 film .

Master and Cadaver

 * The title is a pun on the 2003 movie .
 * The plot parodies .
 * At the end, Maggie imitates Alex from .

Tweenlight

 * The series is punned in the title and parodied throughout the segment.
 * Yogi Bear is seen with Ranger Smith's head.
 * Count Von Count and Big Bird from Seaseme Street are in Dracula-la Land.

Trivia

 * This is the first time the viewers were told not to watch ever since Treehouse Of Horror V.
 * This episode aired after the three week hiatus on FOX.
 * The is heard at a couple of places in the episode:
 * During the "War and Pieces" segment, when Bart and Milhouse kill enemy characters in the video game they're playing.
 * After the closing credits, when the Gracie Films card appears.

Goofs

 * In tweenlight, Ned's body is shown, then a second later, all is left is his glasses