A big mouse at Dizzneeland saying "Our cartoons weren't good, they were just first."
The "No Means No" chant is set to the same tune as the guards' chant in "The Wizard of Oz."
"Song of the South Bronx" poster
Rocky the Flying Squirrel seen
Clip about the future is drawn in the style of The Jetsons.
"Gidget Goes to Space"
Mentioned that Dizznee has bought the rights to "Cosmic Wars".
Xenomorph on display at the Zoo.
The asteroids in space look like the ones in this game
music from 'the Klingon battle' is heard
Yoda appears in the theme park.
Mentioned by Bart
Jabba the Tiki Hut
Homer says "it's not Halloween" to the appearance of Kang and Kodos.
"Jim-Jam Bonk's wild ride" at Dizzneeland
"Toonton Abbey" at Dizzneeland
"The World Series of Chomping" announcer has the same hairdo as Caesar Flickerman.
Diz-Nee Land is #6.
method of abduction taken from Outer Limits episode
image of Marge as the Orion slave girl version of Vina in the end credits montage
Multiple references, including the bridge of the space ship and Homer recording a captain's log.
image of Mr. Burns as the Balok puppet in the end credits montage
image of Homer fighting a purple Gorn in the end credits montage
image of Bart in the Jeffries tube in the end credits montage
image of Barney as Harry Mudd and Patty and Selma as two Alice androids in the end credits montage
image of Eleanor Abernathy, her cats, Superintendent Chalmers and Principal Skinner in the end credits montage
An image of Homer as a drill thrall pleading to the brains in the ending credits montage.
image of Lenny and Carl as Bele and Lokai in the end credits montage
image of Milhouse as Quark in the end credits montage
Remake of the scene where Homer eats chips in space.
Lisa appears as the Borg Queen during the end credits