- Acting for Two: Martin Cort, Peter Stenson, Michael Allaby and Alan James all portray multiple roles throughout the story.
- Creator Backlash: Carole Ann Ford was annoyed with Susan’s characterization in this episode, calling her "pathetic".
- Wag the Director: A rare instance of this being done by the production designer rather than an actor. Director John Gorrie simply wanted to play a sound effect to show that a Voord had fallen into an acid pit, but designer Raymond Cusick convinced him they needed to do it as an effects shot. After seeing the poor result, Cusick would admit he should have left it alone.
- What Could Have Been:
- A scripted scene revealed why Doctor and Susan were in 1963, in particular his bad mood. The Doctor was visiting the BBC for help repairing the TARDIS’ color scanner. Returning empty-handed, he complained about how they were “infernally secretive”!
- Originally, the Doctor accompanied Susan and Sabetha in Episode Four (and his ring would have been found in Vasor's hut along with the travel dials and Conscience keys). This was changed to give William Hartnell a holiday.
- According to Jonathan Sothcott on the DVD Commentary for Dr. Who and the Daleks, Milton Subotsky considered adapting this serial into another movie.
- Working Title: Planet Marinus.
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