- Acting for Two: Not only do both Michael Wisher and Roy Skelton qualify for this by virtue of each playing several different Daleks, Skelton also plays the Spiridon Wester, along with the unnamed Spiridon who captures Vaber and delivers him to the Daleks.
- Creator Backlash: Barry Letts makes clear on the DVD commentary that he was really unhappy with the model Dalek army that's seen in this story. He also wasn't too happy with the sets used for the interior of the Dalek city, though conceded that there probably wasn't the money in the budget to do both the city and the jungle justice.
- Prop Recycling: The Dalek Supreme in this story was a modified prop from Daleks' Invasion Earth: 2150 A.D. that had been given to Terry Nation. Its eyestalk has been replaced with a conventional torch, which flashes when it speaks.
- Real Life Writes the Hairstyle: Katy Manning's hair is shorter in the studio sessions than it is in location footage. Manning had her hair cut between the two lots of recording.
- Recycled Script: Terry Nation rehashed "The Daleks". It contains some of the same plot devices, including: a group of Daleks in a city encountering the Thals on a ravaged planet; a deadly plague instead of a neutron bomb; someone using a Dalek shell as a disguise; the Doctor imprisoned in a cell and with paralysed legs; and the Daleks imprisoned in their city at the end of the story.
- What Could Have Been:
- Originally, Episode Five was to end with all of the Thal characters massacred by the Daleks. Terrance Dicks, however, asked that Terry Nation not include this plot point, as the series was beginning to be criticised for its violent content.
- Latep was originally named Petal. This was changed to avoid confusion with Patel from "Frontier in Space".
- Working Title: Destination Daleks.
- You Look Familiar: Bernard Horsfall (Taron) had previously appeared as "Lemuel Gulliver" and as the "First Time Lord".
Trivia / Doctor Who S10 E4 "Planet of the Daleks"