I was very confused as to why the Taxi Driver, the Cook/Server and every background extra in "It burns" seemed to be the same guy. Knowing that the character's name is "Multi-Purpose Boy" makes it more understandable. Also, shame we never got to see Mrs. Fisgone in anything, I believe she's the only character showed at the end who hasn't made a single other appearance.
Not sure, found the It Burns! video randomly in my recommended today, only to realize I listened to this song 10 years ago a few times without knowing that it came from this show.