The park in the episode is said to be inspired by Recreation Park in Rod Serling's hometown of Binghamton, New York. Like the park in "Walking Distance", Recreation Park has a carousel and a bandstand. There is a plaque in the Recreation Park bandstand commemorating the episode.
A sign at the gas station reads, "Service station, Ralph N. Nelson, Prop." Ralph W. Nelson was the production manager for most Twilight Zone episodes including this one.
This is the first of only four episodes of The Twilight Zone (1959) in which Rod Serling uses a mid-episode narration. The other three are Time Enough at Last (1959), I Shot an Arrow into the Air (1960) and I Sing the Body Electric (1962).
The episode was filmed predominantly at sets built for Meet Me in St. Louis (1959). The carousel used in the episode was a rental.
This is the only instance where a person is shown entering the Twilight Zone. When Martin is looking at himself in the mirror at the gas station, the camera's view remains fixed on his reflection as he turns and starts to walk toward the town. The very next shot is on the huge mirror hanging in the pharmacy as Martin, again as a reflection in the mirror, enters the store. In effect, Martin has "gone through the looking glass" in order to return to his hometown 25 years earlier.