The Bonne Terre mine in Missouri featured in this episode is part of the Southeast Missouri Lead District. This mining area covers about 4,000 square miles and seven counties southwest of Saint Louis, Missouri. The mine closed in 1962 and subsequently became a tourist attraction, including underground scuba diving as the lower three of its five levels have filled with water.
Robert L. Ripley states the Cape Romain lighthouse tower is "nearly 200 feet high". It actually is 150 feet high, which is "nearly 200 feet" only if one is rounding to the nearest hundred feet. The lighthouse was automated in 1937 and no longer needed a resident keeper. It was deactivated in 1947. The structure leans three feet off plumb towards the mainland.
Vitaphone production reel #1361.