It still used one. But it was heard a lot less often. I'm pretty sure the last episode had none at all.
It gradually stopped being a sitcom after that. Once Mike Farrell and Harry Morgan joined up, it was still funny for a while. Then Frank Burns...
The pilot was filmed in December 1969, which backs up your reasoning.
Life On Mars. It only ran 17 episodes.....but I have them all.
Sid Fairgate (Don Murray) on KL. They redid the credits for the new season and he was in them among the stars in alphabetical order. Episode 2...
She's not a train. There's no need for her to announce her departure. Begone!
Separate names with a comma.