The scene with Billy the Kid was filmed at Vasquez Rocks State Park, outside of Los Angeles, California. This location has been used in many TV shows and movies, and is instantly recognizable for its unique rock outcroppings. It is most famous as the filming location for Arena (1967), in which Captain James T. Kirk fights the Gorn.
This episode takes place in three different settings: Santiago, Cuba on July 1, 1898, the Wild West in 1880 and Philadelphia, Pennsylvania on June 10, 1752.
Fredd Wayne has played Benjamin Franklin in other TV shows like "Bewitched".
Benjamin Franklin, the kite, and the key. While this was an iconic experiment, many writers have Franlin "discovering electricity" when electricity was already well known. This show's writers correctly had Franklin looking into the electric component of thunderstorms. To simplify matters they omitted the metal spike on the kite, the wet hemp string , dry silk string, dry roofed shelter, leyden jar capacitor, and Franklin's son. While lightning did not strike the kite (which would have killed Benjamin) a substantial static charge was developed.