Trivia: Location filming of "The War Games" took place in East Sussex during April 1969. To depict the desolate landscape of "no-man's land" during 1917, the location shoot was done at the Brighton Corporation Refuse Tip at Sheepcote, near Brighton. The very same location had been used just a few months before, also to depict "no-man's land in 1917" by Richard Attenborough, for his film Oh What A Lovely War.
Trivia: In the animated reconstruction, released in 2006, the words "Bad Wolf" can be seen on a wall at one point. The phrase was a major plot point in the first season of the new series, where it turned out in the season finale, "The Parting of the Ways", that companion Rose Tyler had scattered them across time and space as a message to herself while temporarily possessing the power of the entire Time Vortex.