The painting for this episode includes a likeness of Rod Serling. Unusually, it is also shown at the end of the episode.
The diner set that appears in "Midnight Never Ends" is recycled and appears in the episode "The Tune in Dan's Cafe".
Tom Wright's painting for "Midnight Never Ends" is his only depiction of Serling for this series, and for the one segment in which one looks in vain for the writer's individual style.
Actors Glenn Corbett, Barbara Babcock, Fred Carson, and Pamelyn Ferdin from the episode "Brenda" all appeared separately in different episodes of Star Trek (1966).