In the Lovesick Hotel sequence, Lupo the Butcher, from the short film of the same name directed by Danny Antonnuci, makes a cameo appearance inside a suite. The butcher threats the main character by saying "I kill you" and throwing his meat cleaver to a table. It is unknown if Danny Antonnuci let Bill Plympton use his character nor if the creator did work n The Tune, though his name doesn't appear in the credits.