Kenny Williams later did a couple other Heatter-Quigley game shows, High Rollers and Gambit.
Disc jockey Shadoe Stevens announced the Davidson version and the first seasons of the Bergeron version. On the former, he typically sat in the bottom center square as well. Sometimes, his brother Richard (also a disc jockey) filled in for him.
For one week of the Davidson version, Shadoe hosted and Howard Stern announced from Shadoe's usual square.
Jeffrey Tambor (The Larry Sanders Show) took over on the Bergeron version for a season. When he was unavailable, producer Henry Winkler (yes, that one) filled in.
John Moschitta (who holds the Guinness record for "world's fastest talker" and is known to children of the 1980s as the Micro Machines Man, in addition to doing FedEx commercials) announced the final Bergeron season and later announced Balderdash on PAX.
Keep Circulating the Tapes: The Peter Marshall-hosted versions were believed to have been largely destroyed until around 2002, when several hundred episodes from both the daytime and nighttime versions were found. Even then, GSN only aired them from 2002-2003.
The Pete Best: Prior to the GSN reruns, who remembered Buddy Hackett being the regular Center Square before Paul Lynde?
Even since the GSN reruns, most people still don't remember Buddy Hackett being the regular center square.
Troubled Production: The Vegas episodes. Paul Lynde was frustrated by the supposedly inferior lodging facilities in Vegas (among other things) and in general soured the overall mood.