I have read somewhere that Rosie O'Donnell was supposed to make a guest appearance at one point, but her appearance was cancled for some reason. As for the appearance of the writers for that Cosby Show episode, I would guess that you are referring to the scene where the youngest daughter goes back int ime to talk to people. One of them was Matt Robinson, who originally played Gordon on Sesame Street (though I'm not sure if he was a writer for that series, but I know that he worked behind the scenes on that show). And now for my next question to Jim Lewis: One of the main differences between The Muppet Show and Muppets Tonight (and there were a lot of big differences) is the fact that while each episode of The Muppet Show always had only one human guest star (occassionally two, or a group), Muppets Tonight frequently had cameo appearances by other celebrities who weren't billed as guest stars, some of whom even had their own subplot (the only time multiple celebrities were biled as the guests was in the episode with Coolio and Don Rickles, and I am surprised that Don Rickles was billed as a second guest star. His screen time didn't seem to differ much from George Takei's screen time in the Andie McDowell epsiode, or Gilbert Godfrieds screen time in the Dennis Quade episode, and those actors didn't get billed as guests, and the Coolio/ Don Rickles episode also featured appearances by other celebrities), and sometiems there were just other human extras (non-celebrities). The Muppet Show never featured any cameos by any humans who weren't billed as guest stars. Do you know why the decision was made for Muppets Tonight to feature more celebrities than just who Kermit announced as the guest star? Of course, the MupeTelevision segments from The Jim Henson Hour did also feature other humans besides the guest stars, usually Christopher Langham, but also the actors in the Fashion Doll Channel sketches, and of course Jim Henson in the introductions.