Peter Boyle (Young Frankenstein, Everybody Loves Raymond)made an uncredited cameo. It is a scene where Del walks into the studio. Sally Starr, a hero on 1950's Philly kid shows, asks "Uncle Pete" to draw Del a picture. In fact, that is what Peter Boyle's real father, Uncle Pete, did on Philly TV in the 50's, drawing pictures between cartoons on his after school show.