Trivia: This serial is the first of only two classic Doctor Who stories to be recorded entirely on film as opposed to videotape; this was an emergency measure necessitated by the unavailability of studios due to industrial action at the BBC. It was also the first ever Doctor Who adventure to be filmed in colour (contrary to popular myth, no 1960s episodes of Doctor Who were shot in colour).
Doctor Who (1963)
3 trivia entries for season 7
Other mistake: The Brigadier says UNIT HQ is 'a Top Secret establishment'. It is, in fact, so secret that it has a large sign outside informing the world not only of its function, but also the name of the commanding officer.
Castrovalva - S19-E1
The Doctor: That's the trouble with regeneration, you never quite know what you're going to get. (00:12:15)
Earthshock - S19-E6
Question: In Earthshock, season 19, at the end of episode 3, the Cyber Leader views his troops marching down the corridor. Each column is headed by a Cyber Leader. Is this a mistake, or is there more than one Cyber Leader allowed per army?
Answer: In 'The Five Doctors', three separate Cyberleaders are definitely used. So it's likely that Cyberleaders are like unit commanders, of which a fair-sized army might have several.
Daria Sigma