- Actor-Inspired Element: It was Rodney Bewes' idea to give Stein a stutter.
- Cast the Runner-Up: Leslie Grantham was considered for Lytton. He chose the role of Kiston because it had more screen-time. Del Henney was also considered before being cast as Col. Archer.
- Contractual Immortality: Davros was supposed to be Killed Off for Real in this episode. However, the estate of Terry Nation objected.
- Creator Backlash:
- Eric Saward was dissatisfied with the story, later saying that it was too frantic, with too many ideas, and he regretted the excessive body count. The main plot was the Daleks releasing Davros so he might find a cure for the Movellan virus. There were several sub-plots: the creation of duplicates to invade the Earth; the capture of the Doctor to create a clone to assassinate the Time Lords' High Council; Davros's scheme to create a new race of Daleks. As none of these are dealt with at any length, he felt they distracted from the central plot.
- Director Matthew Robinson felt the story was convoluted and had too many twists.
- John Nathan-Turner hated the Dalek-like helmets of Lytton's troops, but did not have the time to change them.
- Edited for Syndication: This was originally a four part story of 25 minute episodes, but due to The BBC's coverage of the 1984 Winter Olympics, it was compressed to two 45 minute episodes. Reruns used the original four episode format.
- Enforced Method Acting: Tegan's departure was shot last and both Peter Davison and Janet Fielding were visibly upset.
- Method Acting: Janet Fielding walked around the sets kicking scenery to get herself in the mood for Tegan's leaving scene.
- The Other Darrin: Terry Molloy takes over as Davros. Once again, Michael Wisher was unable to reprise his role due to a theatrical commitment.
- Production Nickname: Davros's new mask, sculpted by Stan Mitchell, was nicknamed "Ena Sharples" by the production team due to its perceived similarity to the legendary Coronation Street character.
- What Could Have Been:
- The Dalek Emperor appeared in early drafts.
- This was originally supposed to be the last story of Season 20, but industrial action prevented it from being filmed back then. The original incarnation of the story would have been helmed by "Earthshock" director Peter Grimwade, but he fell out with producer John Nathan-Turner in the interim, leading to his being replaced by Matthew Robinson for the finished product.
- Patrick Stewart and David Warner were on the short-lists for Colonel Archer.
- Honor Blackman, Judi Dench, Joanna Lumley and Penelope Wilton were considered for Styles.
- Steven Berkoff, BRIAN BLESSED, Timothy Dalton, John Rhys-Davies, Patrick Stewart and David Warner were considered for Lytton.
- Jim Broadbent was considered for Tropper.
- Word of God: An article by Russell T. Davies in the Doctor Who Annual 2006 suggested that the Dalek Supreme's attempt to assassinate the High Council was one of the initial clashes in the Last Great Time War mentioned in the 2005 series.
- Working Title: The Return, Warhead, and The Resurrection.
Trivia / Doctor Who S21 E4 "Resurrection of the Daleks"