- Contractual Immortality: This was meant to be the last Dalek story, until the last minute.
- Executive Meddling: During filming of the last episode Timothy Combe got a call from Sydney Newman telling him "Don't kill the Daleks". Not wanting to redo the whole thing, Combe had a "bulb" idea that he'd have some of the destroyed Daleks with flashing lights, giving the implication that they were still alive.
- Exiled from Continuity: The serial was supposed to depict the true and genuine final end of the Daleks. It was going to stick because Terry Nation wanted to sell a Dalek show in America. The pilot fell through, and by 1972, the Daleks were back from their long exile from continuity. (This was parodied on a special feature on the DVD of "The War Games" in which two Cloudcuckoolander Time Lords dubbed into the trial sequence cut off the Doctor from showing images of the Daleks 'for copyright reasons'.)
- First Appearance: Of Victoria Waterfield.
- Missing Episode: Only episode 2 is known to survive, leaving six episodes missing.
- What Could Have Been:
- Terry Nation was unable to write this story, as he was working on getting his Dalek Spin-Off made.
- Originally, the Doctor and Edward Waterfield were to travel back to Earth in the year 20,000 BC and retrieve a caveman named Og, from whom the Doctor is to deduce the essence of humanity. The Daleks' plan was to eradicate this quality from every generation of man, thereby eliminating Earth as a threat. Meanwhile, Jamie and Victoria were held hostage on Skaro. The character of Bob Hall was initially called Bill, and was a gangster. Anne Waterfield probably Victoria's mother also featured in the plot in the early stages of its gestation.
- Anneke Wills and Michael Craze were both contracted up to episode 2 of this serial to appear as Polly and Ben. However, it had been decided during the previous serial that the characters would be dropped; consequently both actors had their contracts paid up and were released after episode 2 of "The Faceless Ones".
- There were plans to make Mollie Dawson stay on as a companion before Peter Bryant decided on Victoria.
- Working Title: The Daleks. War of the Daleks was also rumoured.
- You Look Familiar: John Bailey, who played Edward Waterfield, had previously appeared in "The Sensorites".
Trivia / Doctor Who S4 E9 "The Evil of the Daleks"