The show went from black-and-white to color in the mid-1960s, with the final black-and-white episode shown on February 10, 1967. The show went from a half-hour in length to one hour starting on December 1, 1975. Also in 1975, they stopped doing the show live, and decided to tape it instead - that way, more than one episode could be taped in a day, and the actors would not have to work every day.