When The Doctor rides away on the motorbike from the heat shield, Jon Pertwee actually went for a joy ride and no-one knew where he had gone.
The sections with the heat shield had a few problems as it had snowed so they had to clear it away, but patches can still be seen in the fields in the distance.
This was the only episode of "The Dæmons" which remained at the BBC on its original PAL 2" color videotape.
The words used in the episode by the Master for his incantation is parts of nursery rhymes reversed such as Mary had a little lamb.
This episode was watched by 8.1 million viewers on its original transmission.