Treehouse of Horror XVIII/References

References/Trivia

Cultural References

Many parts of the segment "E.T., Go Home," are references to the film E.T. the Extra-Terrestrial, with Bart in the role of Eliott and Kodos as E.T. The "Mr. and Mrs. Simpson" segment is a parody of the 2005 film Mr. and Mrs. Smith. In the final segment, "Heck House", Groundskeeper Willie's tractor transforms into a robot and kills him, parodying Transformers.

This is the first Treehouse of Horror to have the opening credits appear on the same location as the title.
A Funzo from Grift of the Magi appears on Bart's shelf.
A Linguo Is seen on Bart's Toys
A Phonics Frog also appears on the shelf

The aliens come out of the portal, however in the next scene, the aliens just start coming out, although in the previous scene a few had already come out.
Homer and Marge hide their guns from Bart and Lisa, and the guns just appear out of nowhere. Next, Marge puts her hands down, and the gun's disappeared again. Then, when Bart and Lisa go back upstairs, Homer puts his hand down and his gun's disappeared.
Bart, Milhouse, Lisa and Nelson start throwing water balloons from behind a bush, but when Bart runs to the three to start throwing balloons, they are not behind a bush.
The Simpsons' house roof is flat.