On August 20, 1951, filming of the Adventures of Superman continued with the third set of five episodes: "The Monkey Mystery," "The Deserted Village," "Rescue," "Treasure of the Incas," and "The Haunted Lighthouse." This set of episodes was filmed between Monday, August 20 and Saturday, September 1, 1951. A couple things to note: 1) These episodes were grouped together because the same cave was used in all five. 2) On Friday, August 25, Steve Carr was the doctor on the train for part of the day and Lt. Haines for the remainder. 3) Michael Vallon worked on only one day. So in "The Monkey Mystery," when Lois asked Clark, "Today is the 24th, isn't it?" she's wrong... it was the 31st. It's interesting to note too that all of Allene Roberts' scenes were filmed in one day.