John Forsythe was uncredited throughout the series. Forsythe thought it would add more mystery to the show. If he had been credited, it would have had to say "voice only" because a stand-in was used whenever Charlie's partial back was filmed.
John Forsythe was called in at the last minute to voice Charlie, when the original actor (Gig Young) who had been cast turned out to have a drinking problem. Producer Aaron Spelling called Forsythe past midnight on a Friday, and begged him to come to the studio immediately, as the pilot was to be broadcast after the weekend. Forsythe ended up recording his first voice-over in his pajamas.
The third season of the show was the only season to not feature a major cast change.
John Forsythe was never on the set, his voice was recorded, and dubbed in later. He told Aaron Spelling that for him to make an on-screen appearance, he would have to be paid a lot of money. Forsythe also never visited the set during the entire run of the show. In many scenes, it is obvious that it isn't him but a stand-in whose back is partially filmed.
The Angels all drove Ford automobiles. Jill, and later Kris, drove a Cobra, Kelly drove a Mustang, and Sabrina drove a Pinto. For the record, Bosley drove a Thunderbird.