 Maurice LaMarche voiced both a television critic and the late comedian Rodney Dangerfield, who had himself guest starred on the show in the 1996 episode "Burns, Baby Burns".Kelsey Grammer reprised his role as Sideshow Bob in a scene showing him arguing with his replacement on Krusty's show, Sideshow Mel.David Hyde Pierce, who had previously appeared as Bob's brother Cecil, had a cameo as himself acting in the role of Felix in "The Odd Couple".