At 39 minutes, "Her Pilgrim Soul" is the longest story in the series.
'I of Newton''s storyline had to be reworked: the original short story included a puzzling math equation that had since been solved. After a UCLA math professor pointed this out to producers, they then asked the professor for a newer equation that hadn't been solved. He gave them one, and that's what appeared in the episode.
The move that Kevin uses to defeat Nola in their chess game is called a 'smothered mate,' and can only be performed with a knight, due to the unique rules by which it moves.
Alan Brennert wrote the short story "Her Pilgrim Soul", which is included in his short story collection of the same name. He adapted the story to be used on The Twilight Zone (1985).
The Devil's T-shirt displays a new slogan in different scenes. The phrases included are: "Hell is a Summer Festival," "Hell is a City Much Like Newark," "Over 2,000,000,000 Served," "Gehenna: More Than a Place, a Way of Life," and "Let's Do Damnation."