Silent film comedian Buster Keaton guest starred in two episodes, "A Very Merry Christmas" (December 24, 1958) as Charlie, a hospital janitor who brings gifts to the children's ward, and "Now You See It, Now You Don't" (1965). Child actor Charles Herbert also had a recurring guest role in four episodes as David Barker, a runaway child whom the Stones assist. In the 1960 crossover episode "Donna Decorates", Jay North appeared with his "Dennis the Menace" co-star, Joseph Kearns as Mr. George Wilson. Esther Williams guest starred as Molly, a fashion designer and friend of Donna's who is herself about to marry a doctor in "The Career Woman" (1960). In real life, Williams and Reed had been close friends since the early 1940s, when they were rising MGM contract stars.