Plot hole: When Maaga has the Doctor and his crew in her power, why doesn't she demand that they take her off the planet in the TARDIS?

Plot hole: The Daleks announce their secret plan on the city's external loudspeaker system, where Cory hears it. It can hardly be a 'secret' plan if it is broadcast for all to hear...

Deliberate "mistake": William Hartnell appears in the credits at the end of this Doctor Who story...despite the fact that he did not actually appear in this episode at any stage.

Audio problem: At one point where the trail of Visian footprints are appearing, we hear the sound effect of the foot hitting the ground, but the footprint fails to appear.

Visible crew/equipment: At the beginning of episode 2 when the Daleks are talking, a stage light is reflected on one of the Daleks.

Factual error: Billy Claiborne, the only member of the Clanton gang to survive the O.K.Corrall shoot-out, is conspicuous by his total absence in this story. Maybe that's how he survived?

Plot hole: The Clantons are amazingly bad shots. The Earps walk slowly down the street at the start of the climactic gunfight and don't get hit even once by the hail of gunfire.

Revealing: The "American" accents in this episode are all over the map and frequently inconsistent within the same scene.

Continuity: The six-shooters, in the climactic gunfight, fire off a lot more than six shots without reloading.

Factual error: The story The War Machines is (probably) set in London in July 1966. At the time, England, and more specifically, London, was hosting the FIFA World Cup Soccer Tournament. Yet, you wouldn't know it from watching this Doctor Who story...Sir Charles Summers mentions July 12th (1966) which was the day after England played Uruguay at Wembley and the day before Mexico played France. The other matches involving those four were played in London during the time the events of The War Machines are supposed to take place, yet no mention is made of the fact, there are no foreign football supporters roaming the streets and no flags or posters on display. Did the story take place in an "alternate reality" London of July 1966?

Plot hole: It is highly unlikely that the discovery of a dead down-and-out's body in an empty warehouse would be reported in a national newspaper, especially as the discovery had to have been made when the newspapers were already being printed.

Factual error: This story is set in London in 1966 - the Post Office Tower was completed in October 1965). July 12th 1966 was a Saturday, not a Monday.