[quote name=\'Jay Temple\' post=\'177049\' date=\'Feb 3 2008, 08:04 PM\']That's the one. (I wanted a better wording, because you could stretch it to include SNL or SCTV parodies.) And Trapper John is right also.[/quote]
It's not the parodies you'd worry about, it's the performers' stage work. I happened to remember the Daddy Warbucks thing because I remember what a bad player Shelton was in his single appearance, and later remember Dick Clark explaining why Schuck was playing with a shaved head.
Lots of those stars, especially when the show was in New York, had extensive stage credits. Not only Broadway, but a bunch of them would do regional theatre and summer stock, where there were only so many popular plays to go around. So there are probably tons of connections in that world. Anita Gillette alone has an astonishing number of musical comedy characters to her credit, and in fact replaced Lucie Arnaz in one show, so there's at least one more just limited to Broadway.
It's still a really neat question, and it took a while for me to come up with Felix Unger, so there probably aren't a lot of other TV or movie roles shared by two Pyramid players. Incidentally, I first though of Trapper John for the first part of your question, but didn't follow through to realize it was the answer to the second part.