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
Well, Mr. Mega, you may be the richest, most famous grand enchilada, numero uno hitmaker extraordinaire person in the music biz, but I just met some people in a little town you never heard of called Flooby Nooby. And they showed me something even you don't know. What's important is not how much money you make or how many people you impress, but what's inside here in your heart. And if you listen to that voice deep inside, then nothing is impossible.