- Acting for Two: Denis Lill was both the Simulant Captain and Death, which makes sense, since the Simulant Captain would have been the one to create the Armageddon virus and his role as the episode's Big Bad would have been etched into Kryten's mind for the Battle in the Center of the Mind that his psyche interprets as a western.
- Actor-Inspired Element: It was Danny John-Jules' suggestion that the Riviera Kid be Mexican.
- California Doubling: The western scenes were filmed in the Laredo Western Town in Kent where history enthusiasts re-enact the American Old West.
- The Cast Showoff: Robert Llewellyn and Danny John-Jules were skilled horse riders but Chris Barrie and Craig Charles had never ridden on horses before. Charles was eager to learn but Barrie was very frightened of riding the horse. Charles played a prank on Barrie by slapping Barrie's horse on the behind causing the horse to rear up and run off at full speed. Barrie was extremely angry at Charles for doing this.
- Deleted Scene: Scenes cut from the episode:
- The original pre-record version of the Vindaloovian aftermath was re-staged more successfully in front of a studio audience. The original take was longer, with the Simulant Captain stood over them watching as they pretended to be Vindaloovians, and the re-shot trimmed it down for time.
- Five dialogue trims, mostly from within the Simulant Battle Cruiser during the battle with Starbug. As the Simulant Lieutenant makes it clear that they have become too damaged in the battle to return fire, The Simulant Captain says that they "will find their corpse has a sting in its tail" regarding the Armageddon Virus, before his death is seen.
- Working Title: The Four Horsemen of the Apocalypse, High Midnight.
Trivia / Red Dwarf Season VI Gunmen Of The Apocalypse