Krusty's show was originally supposed to be canceled after Krusty offers kids a coffee table book of him in sexually explicit positions and situations (similar to the MadonnaSex book that was popular at the time), only to be arrested by the FBI for peddling pornography to minors. Naturally, the scene was cut because it was too risque and replaced with Krusty's show getting canceled after he airs a bizarre Soviet version of Itchy and Scratchy ("Worker and Parasite") and everyone in the studio audience leaves.
There was also a scene after the "Krusty Sex Book" sequence where Krusty's producers tell him his show's been canceled and will be replaced by a hemorrhoid infomerical, with Krusty begging to be cast as either a hemorrhoid sufferer ("Ooh, oh, that hurts! Ah, oh! Is there no relief?") or one of the "After" guys ("Aah, oh, that's better. I can ride a bike again!"). They turn him down on both suggestions.
Stunt Casting: More guest voices than usual turn up; aside from those mentioned above, Barry White is in the opening scene as a guest on Springfield Squares. Elizabeth Taylor gets only two lines, but that's still more than she got back in "Lisa's First Word".
Unintentional Period Piece: The guest voices definitely date the episode to The '90s, as they were experiencing career peaks or at least were household names to viewers (as in Carson and Taylor's cases) at the time.
Wag the Director: The original role pitched for Johnny Carson was one where he visited the Simpson family's house and mooched off them. Carson felt this role was too degrading, so instead the writers took the opposite route and portrayed him as extremely versatile and multi-talented. Bette Midler's condition for guest starring was that the show promoted her anti-littering campaign.