Here are a few off the top of my head: Dick Van Dyke Show: Johnny Carson was originally considered to play the lead character. Obviously, that would have required a different name for the show. Carl Reiner played the lead character in the show's pilot. Gilligan's Island: Carroll O'Connor was originally considered for the role of the Skipper and Raquel Welch was originally considered for the role of Mary Ann. Brady Bunch: Gene Hackman was considered for the role of Mike Brady. Lost in Space: This wasn't a sitcom, but it may as well have been. Carroll O'Connor was considered for the role of Dr. Smith. Bewitched: Dick Sargent was the preferred choice for the role of Darrin when the show first began. He wasn't available, so Dick York was selected instead. Years later, when York's health prevented him from continuing, Sargent replaced him. Bewitched: While it was never mentioned for obvious reasons, Uncle Arthur (Paul Lynde) is widely recognized as TV's first gay sitcom character. Bewitched: Censors let Endora and Maurice live a blatantly open marriage because they were a witch and a warlock. Bewitched: This was the first 'modern' sitcom to allow a married couple to sleep in the same bed. Cheers: William Devane (Knots Landing) was first considered for the role of Sam Malone. Married... With Children: In the early episodes, it was mentioned several times that Peggy Bundy's family lived in Milwaukee. As time went on, her family lived in the fictional Wanker County, Wisconsin. However, she did attend Polk High School with husband Al in Chicago, but the connection was never explained. She was pregnant with Kelly when they got married after graduating. Married... With Children: There were several episodes where Peggy Bundy was pregnant. It was fully intended that the Bundys would have a baby on the show. The neighbors, (the D'Arcys) were expecting at the same time. When actress Katey Sagal lost her baby in the seventh month, it was decided that neither pregnancy ever happened because it would be too hard on Sagal to have a baby on the show. The episodes were 'erased' when Al woke up from a 'Dallas-like' dream. Segal's subsequent two pregnancies were covered up by creative camera work and maternity leaves. Leave it to Beaver: Censors delayed the airing of an early episode for several weeks because it showed a toilet in the bathroom. The toilet was germane to the plot as the toilet tank was home to the boys' pet alligator. Brady Bunch: Their bathroom never had a toilet. Leave it to Beaver: Did episodes on alcoholism and divorce years before the topics became 'fashionable'. Dick Van Dyke Show: Drove censors into a hyper-tizzy by doing race-related comedy ahead of its time. In one episode, Rob Petrie was convinced his baby was switched at birth. Laura Petrie was relieved when they found out that Mr. and Mrs. Peters, the couple allegedly possessing the Petrie baby, was black. On another episode, Rob and Laura accidently got black permanent dye on their hands and arms before they were to accept a racial equality award. Petticoat Junction: Sharon Tate (who was murdered by Charles Manson) was cast as the first Billie Jo, but appeared on publicity pictures only. Some say it was because she posed in Playboy. Others explain that her agent preferred that she persue a movie career. The Lucy Show: Vivian Vance played TV's first divorced sitcom regular.