In Serling's original script, the lead character's name was Barnaby Grudge - i.e., B. Grudge, a play on the word "begrudge". ABC network censors thought that viewers would miss that allusion and instead believe the name was chosen as a slap at U.S. Senator Barry Goldwater, a man associated with nuclear war, and ordered the author to change the character's name. Serling settled on Daniel Grudge.
Peter Fonda was edited out of this film shortly before it aired, yet he is still visible in a portrait on a wall of the set.
The opening credits are alphabetical; the closing credits in order of appearance.