Billy's extra gun at the gunfight at the creek starts off as a single-action blue steel Colt Bisley, recognizable for the distinctive shape of its grip frame, and turns into a nickel-plated double action revolver when he crawls out to the log.
When the Sheriff and his wife go away for a vacation there is a scene at a hotel desk as they are checking in. The desk person gives them a room key and tells them they are in room "206." However, as their room door is opened by the bell-boy the room door shows that the room is numbered 12?3.
Billy tells Chuck's wife that he was a member of the Rough Riders in the Spanish-American War (1898). Chuck later asks his wife if she wants to attend the Fitzsimmons-Corbett fight, which took place in March 1897.