- 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 and Wisher voices the Dalek Supreme as well as a few mook 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.
- Spared by the Cut: 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.
- What Could Have Been:
- Latep was originally named Petal. This was changed to avoid confusion with Patel from "Frontier in Space".
- This serial was originally intended to be parts 7-12 of "Frontier in Space", which consequently would've tied the latter with "The Daleks' Master Plan", also co-written by Terry Nation, for the position of the show's longest serial by episode count (discounting the 14-part "The Trial of a Time Lord", which was produced as four separate serials). However, the production staff ultimately opted to bill "Frontier in Space" and "Planet of the Daleks" as separate, but interconnected stories; the fact that episode one of "Planet of the Daleks" opens by reprising the closing moments from episode six of "Frontier in Space" is a remnant of the original idea.
- Working Title: Destination Daleks.
- You Look Familiar: Bernard Horsfall (Taron) had previously appeared as Lemuel Gulliver and Goth.
Trivia / Doctor Who S10 E4 "Planet of the Daleks"