Goobacks/Trivia

Trivia

 * The Raisin girls and the Goth Kids are among the townsfolk who help to clean up South Park during the closing montage.
 * The field of flowers where the townspeople gather up litter previously appeared in "AWESOM-O"; it will be seen again in "Follow that Egg".
 * When the protesters think they need to turn gay to stop the future, Jimbo states "I ain't turnin' queer!" This statement contradicts the events of It Hits The Fan, wherein Jimbo's unbleeped use of the word "fag" inadvertently outed him as a homosexual.
 * The homeless guy who was shot in "The New Terrance and Phillip Movie Trailer" appears in this episode.
 * Kevin Mephesto can be seen in the crown when townsfolk sing.

References to Popular Culture

 * When the "time border" gets wider and many "time immigrants" come through, it resembles a scene from Close Encounters of the Third Kind.
 * The appearance of the "time border", including the lightning storm immediately before its appearance and the growing blue sphere, closely resemble the special effects used to show characters arriving from the future in the Terminator films. There is also a scene where a reporter mentions that the time portal follows the "Terminator rules", instead of Back to the Future rules of time travel.
 * In the news scene with female reporter which boys watch at the woman's house, a hangar numbered "18" can be seen behind the fence. This is a reference to the Roswell UFO incident in 1947, in which the remains of aliens and their spacecraft were supposedly flown to Wright Field (now Wright-Patterson Air Force Base) in Ohio and stored in "hangar 18".
 * The immigrants come through the portal covered in purple goo, hence the name "goobacks". This is a reference to the American term "wetbacks", a derogatory slur for illegal Mexican immigrants.
 * After Goobacks start arriving en masse, there is road a sign shown on the highway near the portal cautioning motorists to watch for Goobacks in the road. There are actually similar signs on I-8 in the US state of California cautioning motorists to beware of illegal aliens in the road.