I thought this was interesting:
I recently read that Louise Lasser was banned from ever hosting SNL
again because Lorne Michaels thought her episode was terrible.
Personally, after watching it on the DVD SNL Season 1 set, I didn't
really find it to be bad at all. But this did get me thinking, which
celebrities have been banned from talk shows/game shows/hosting
something/etc. for whatever reason?
The deal with Louise Lasser is that she was apparently undergoing
"personal problems" and was incoherent through most of her show. Lorne
Michaels never wanted the episode repeated, but it did go into
syndication after he left as producer in 1981.
"SNL" actually has a pretty extensive banned list.
Charles Grodin hosted one time in 1977. He never showed for rehearsals
and due to that ad-libbed many of his lines and threw everyone off.
Milton Berle hosted in 1979 and was banned because Michaels felt that
Berle mugged to the camera too much, was too reliant on cue cards,
overacted, slipped in his old bits and tried deliberately to upstage
other performers. This episode was banned from rebroadcast until 2003.
Robert Blake was banned from hosting in 1982 when he crumpled up a
script and threw it at writer Gary Kroeger.
Infamously in 1982 fans were allowed to call a 900 number to vote on
whether Andy Kaufman should ever be allowed back on the show. The fans
voted him off forever. This was actually Kaufman's idea to do.
Steven Seagal was banned from hosting after a 1991 appearance for being
difficult to work with. Allegedly, a year later Nicholas Cage apologized
to Lorne Michaels for the way he was acting and said he must be the
biggest jerk they have ever had. Michaels told him he was being hard on
himself and the biggest jerk ever was Seagal.
Martin Lawrence was banned in 1994 for a monologue that featured heavy
talk about ‘female genitalia.' In rebroadcasts of the episode the
monologue has been omitted and text goes over what Lawrence generally said.
Chevy Chase was banned from hosting "SNL" ever again in 1997 after 9
appearances and serving as a cast member in the first season. Chase was
known for always being rude to the crew. However, Chase has made some
cameos since that time.
Adrien Brody was banned in 2003 after improvising an introduction for
musical act Sean Paul. Brody wore fake dreadlocks and used a fake
Jamaican accent. Brody also called Sean Paul "Sean John." Lorne Michaels
insists that any and all ideas be run by him first.
Several musical acts have also been banned from the show including
Sinead O'Connor, Fear, The Replacements, Frank Zappa and Cypress Hill.
Zappa was also host in a 1978 episode where he alienated everyone in the
cast, save for John Belushi, with his odd humor. Elvis Costello and the
Attractions were banned at one point for switching songs, but that was
lifted.