When Slim is coming down the road in the buckboard with Daisy and Mike, it's just the 3 people in the wagon. The next scene they are coming around the corner of the ranch house and suddenly Slim's horse is tied to the back of the buckboard.
Near the end of the show, when the two bad guys are going to bushwhack Slim, there is a shot of Slim, and in the distant background, an automobile drives between two of the town buildings.
Near the end, Slim is confronting Mrs. McGovern after being ambushed at the waterfall. He says, "The name McGovern can take face up to its own" and then he mounts his horse. As he is preparing to mount the horse, an on-set telephone can clearly be heard ringing.