Rich Hall left in 1984 to star in Saturday Night Live (1975), but he only remained on that show for one season. He gradually returned to this show, making guest appearances before he was reinstated as a regular cast member.
Danny Breen was initially unhappy on the show, so the producers decided to give his character the worst assignments ever. In a 1985 interview with the Virginia Times-Herald, he said "Everything started to click after that."
Conan O'Brien wrote for the show and it was his 1st gig on LA.
The show was originally developed for ABC. The network executives didn't know what to do with it, so they turned over the rights to the producers, who then sold it to HBO.
Most seasons featured one episode per month, plus some additional specials sporadically. In 1989, the show was drastically overhauled and aired weekly, with "live" episodes which were actually taped on the day that they premiered so they could include up-to-date humor.