Interestingly, Geoffrey Deuel, the man playing younger brother Lester Wakefield, is in fact, four years older than "older" brother Clay Wakefield, played by Peter Strauss. They were born in 1943 and 1947, respectively.
The cowgirl gas station attendant is played by Buddy Epson's daughter Bonnie Ebsen. She appeared in the series six times as various characters.
A sign at the filling station advertises cigarettes: all brands 40 cents per pack.