Opening caption: It's "Hee Haw" with lasers.
The airship is made of Bart Simpson's left ear and right chin
Leela speaks with Fry about her parents watching her from the stars as camera moves up focusing the open sky, while background music very similar to the one played in the movie
Bender: "I have to clean up the set of Free Willy 3"
Leela: "Am I a game to you? Or some kind of even more boring Truman Show?"
Some of the locations in the sewers (Bed, Bath and Beneath, Big Mutant Boy's,etc) are from this episode.
Is featured on a TV screen in the opening sequence.
One of the "memories" seen in the visualisation of Leela's mind is footage from this episode.