[3] Stark also mentioned the show's writers followed an outline made up by actors Roberts and Dunne, giving the characters' backstory including their San Francisco origin.
[3] Wilbur Stark and Jerry Layton had previously co-produced the Colonel Humphrey Flack television series before creating The Brothers Brannagan.
[5] He also reported filming that week centered on the Mountain Shadows Resort and the Squaw Peak Inn,[5] while The Arizona Republic ran a photo of stars Roberts and Dunne at location shooting outside the First National Bank on Central Avenue in Phoenix.
[6] After filming the pilot episode, the production company left Arizona and did not return until late November 1959, when the producers put out an open casting call for extras.
[7] Casting director Ruth Scott said 375 people applied for extra jobs during the single day call, with at least one hired for a speaking role as well.
[3] By April 1960 columnist Eve Starr reported that CBS Films had 16 completed episodes on hand, but The Brothers Brannagan might appear as a syndicated show in the fall since it did not yet have a network sponsor.