The appearance of a cyberman in the Miniscoop is the only appearance of the cybermen during Jon Pertwee tenure. This was due to Terrance Dicks disliking them, as he found them boring. Vorg's line about people not wanting to see a blurry image of them is a reference to this.
Drashig is an anagram of dish rag.
The marshland filming location, Tillingham Marshes (filling in here for the Drashigs' swamp world) was only a short distance from the show's often used quarry location, Carwoods Quarry, in Essex.
An alternative extended version of this episode was accidentally sent to Australia by mistake, it also features a different version of the theme dubbed the "Delaware" theme, this version has since been released on VHS (1995) DVD Special Edition (2011) and Blu ray Collection season 10 Limited edition (2019) and Blu ray Collection season 10 Standard Edition (2021).
This episode was watched by 9 million viewers on its original transmission.