Trivia: The original actor who had been cast as Charlie had a drinking problem, and couldn't deliver his lines properly. John Forsythe got called up by creator Aaron Spelling after midnight on a Friday night and was asked to record lines ASAP because the show had to be aired Monday night. He headed straight down to the studio at 20th Century Fox, still in his slippers and pyjamas, recorded the lines and went straight back to bed.
Trivia: It's been said Cheryl Ladd hated Shelley Hack due to her size intimidating her. She also had Edward J. Lasko reduce Hack's number of lines. Some have reported Shelley would go home in tears which would lead to her resignation at the end of Season 4. Jaclyn Smith and Cheryl wouldn't talk to her at lunch and sat together away from her.