Penny Marshall
Garry Marshall, creator and then part-time writer for "Happy Days", cast Marshall and Cindy Williams to guest on an episode of the show. The installment, titled "A Date with Fonzie", aired on November 11, 1975 and introduced the characters Laverne DeFazio and Shirley Feeney (played by Marshall and Williams, respectively). In that episode, Laverne and Shirley were a pair of wisecracking brewery workers who were dates for Fonzie (Henry Winkler) and Richie (Ron Howard). The pair were such a hit with the studio audience that Garry Marshall decided to co-create and star them in a successful spinoff, "Laverne & Shirley" (1976–1983). The characters of Laverne and Shirley appeared in five more episodes of "Happy Days". In 1982 at the beginning of "Laverne & Shirley"s eighth season, Williams left the show due to her pregnancy. Marshall continued with the show, but it was canceled after the season's final episode aired in May 1983.
Blansky's Beauties
After the end of "Blansky's Beauties", Lynda Goodfriend and Scott Baio would join the cast of "Happy Days" at the start of the 1977–78 season. Goodfriend and Baio, along with their "Blansky's Beauties" co-stars Caren Kaye, Shirley Kirkes and Elaine Bolton, would appear in a similarly-plotted pilot, "Legs," for NBC in 1978, using different character names. This project would be revised further and appear on the network as "Who's Watching the Kids?" in the fall of that year, lasting half a season.