Chuck Connors initially turned down the role of Lucas McCain because he thought the salary was too low. The show's producers then considered James Whitmore and John Anderson for the role, but when they saw Connors' chemistry with child actor Tommy Kirk in Old Yeller (1957), they realized he was the best choice for the role and made him another offer, this time at a much higher salary. He accepted.
Several times paper pads are shown being used. These were invented in 1888, and would not have been used during the time period of the show.