They should NEVER have used Harvey Korman on The Muppet Show. In fact, Robin Williams, a MUCH better comic, should've been on The Muppet Show. He was announced, but they TOTALLY forgot to bring him on the show.
Harvey never did ANY numbers at ALL on The Muppet Show, hostility, ugliness I tell ya. The closing number isn't funny at all, and the episode is NOT fun to watch. The only thing I like in this episode is Fozzie's comedy act. I call Harvey Korman "the Least likable comic to EVER appear on The Muppet Show".
Use Robin Williams!! No Korman!!