Executive Meddling: Executive producer Jo Swerling, Jr. says that as soon as he learned of Pete Duel's death, he tried to end the show, but ABC wouldn't let him. The series was back in production 12 hours later.
Pete Duel committed suicide and was replaced by Roger Davis for the final season.
Sheriff Trevors was played by three different actors during the series' run.
The Opening Narration went back and forth between two actors. Ralph Story was The Narrator in the Pilot Movie. When the series began, Roger Davis took over from Story. When Davis replaced Duel as Hannibal Heyes, Story was brought back.