Most people often get the misconception that British actress Judy Carne made her American debut on Rowan & Martin's Laugh-In. However, that isn't true.
Carne had 2 failed sitcoms under her belt when she was cast by Screen Gems producers Harry Ackerman & Bernard Slade in Love on a Rooftop in 1966. On the show, she played Julie Hammond-Willis, whose father wasn't exactly thrilled with 1) her choice of husband (Peter Deuel, later of Alias Smith & Jones), whose salary was less than $100 a week, and 2) their spartan apartment accomodations.
Impressionist Rich Little, in his first series gig, played Stan, a neighbor of the Willises who was the Kramer of his time, popping in unannounced with some wacky get-rich-quick scheme. Unfortunately, the series was cancelled after 1 season, despite out-polling another ABC frosh, That Girl, in the ratings. Apparently, at ABC, if it wasn't Bewitched, a Screen Gems sitcom had difficulty sticking for a while.
GIlmore Box uploaded the open:
Cashing in on Alias Smith & Jones, ABC brought Rooftop out of the vaults in 1971 as a late-season replacement series, and that's how I came across the show.