With the exception of end-of-season episodes, all episodes originally ended with a brief segment in which Rod Serling appeared on camera (even during the first season when he only narrated the episodes themselves) and told viewers about the next week's episode. These promos were deleted from the syndicated versions of the episodes but were later restored for DVD release, although many now exist only in audio form.
The syndicated version has about 2-4 minutes cut from each episode and starts all episodes with the second season opening credits.
The series' last produced episode, "An Occurrance at Owl Creek Bridge," was originally released as a short film in Europe called Rivière du hibou, La (1962). Serling bought the rights, added Twilight Zone credits and narration, and made it into an episode.