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. See more
Oh, my innocent one, listen not with your ears, but with your heart. See not with your eyes, but with your soul. Feel not with your fingers, but with your spirit. Smell not with your nose, but with your essence. Like a jeweled ring hidden in a loaf of bread, take only the wheat. Leave the chaff behind you. You are hungry, my son. The wisdom nourishes us all. Your goal is the state of oneness of being, not the being of oneness.