200 Motels (1971)
Poster prominently visible on kiosk.
"I saw 200 Motels!"
Centerville: A Real Great Place To Raise Your Kids Up.
"Whoa, Centerville, a real great place to bring your kids up"
"Theo Bikel? This must be 200 Motels"
Beardobees' line at the climax: "This, as you might have guessed, is the end of the movie" is directly from the Frank Zappa movie.
Scrutinizer says that Down and Dirty Duck was made by the same animation company as 200 Motels.
Discussed a few times; some making-of clips shown
Town named Centeville
Rance Muhammitz dialogue (sound only).
Movie is mentioned in episode