- Fandom Nod: Tumblr is mentioned a couple of times, likely a nod to Doctor Who's massive fanbase on that site.
- The Doctor lists one of his rules for the TARDIS as "no hanky-panky", reflecting a decades-old phrase often cited by fans of the classic series.
- Prop Recycling: In Doctor Who Extra, Peter Capaldi confirms he's wearing David Tennant's spacesuit from "The Impossible Planet"/"The Satan Pit".
- What Could Have Been: This was originally written for Series 7B and thus the Eleventh Doctor and Clara Oswald. Needless to say, a lot had to be changed in the interim.
- Working Title: Return to Sarn. This was a reference to the fact that that Lanzarote was used as a filming location for the first time since "Planet of Fire".
- You Look Familiar: Tony Osoba (Duke) appeared in different roles in "Destiny of the Daleks" and "Dragonfire".
Trivia / Doctor Who S34 E7 "Kill the Moon"