 CONT: When Peter takes Mrs. Arness, her dog William, and golf caddy  out for a game of golf, there seems to be an extra player in their  foursome. In the golf cart, sitting just behind the four, is a woman  wearing a hat, taking off her socks. The woman is dressed exactly  like Mrs. Arness. The woman then disappears entirely after Mrs.  Arness takes a swing (she is Mrs. Arness stunt double).