After drinking from a water fountain, Paul notices that his valise is missing. Looking up towards the doors, Paul notices another man running out the door of the bus depot. Pursuing this individual down the street, Paul discovers that he is chasing his own copy, whose face shows excited delight. His copy disappears as Paul calls out "Where are you?" while looking around in confusion and shock. The actual location of the bus deport is not identified in the episode. The de Forest report (script fact checking service) mentioned it could either be in Ithaca or Marathon. Serling answered a fan letter about the episode that he is familiar with the area because of his family summer cabin in Cayuga Lake. Ithaca is located of the southern shore of Cayuga Lake. In a short film pitching the "Twilight Zone" series to a Dutch television station, creator Rod Serling claimed to have gotten the idea for "Mirror Image" following an encounter at an airport. Serling noticed a man at the other side of the terminal who wore the same clothes and carried the same suitcase as himself; Serling considered what would happen if the man turned around and was revealed to be a duplicate of himself. However, the man turned out to be younger and "more attractive". This is one of several episodes from season one with its opening title sequence plastered over with the opening for season two. This was done during the Summer of 1961 as to help the season one shows fit in with the new look the show had taken during the following season. This episode inspired Jordan Peele's 2019 film "Us".