The Talons of Weng-Chiang - S14-E6
Revealing mistake: A 1970s newspaper - the headline concerns Denis Healey, Chancellor of the Exchequer in the 1974-79 Labour Government - can be seen in Litefoot's laundry basket in episode three.
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.
The Dalek Invasion of Earth - S2-E2
Audio problem: In episode 2 you can hear the Black Dalek clear his throat before speaking.
The Dalek Invasion of Earth - S2-E2
Revealing mistake: When Barbara is throwing her bombs, she grabs the window frame in front of her, which wobbles alarmingly.
Revelation of the Daleks - S22-E6
Visible crew/equipment: In the first scene of episode 2 you can see a member of the crew casually walking in the background.
The Caves of Androzani - S21-E6
Factual error: When the Doctor is trying to land the ship, from the video screen it appears that they are moving towards the planet way too fast to make such a safe and quick landing. Also, the ship doesn't seem to have even penetrated the planet's atmosphere yet it lands seconds later.
Revealing mistake: Perhaps criticizing the special effects is unfair, but the extremely obvious use of toy tanks and a rag-doll Sarah in certain scenes is one of the worst examples in the history of the show.
Audio problem: When Irongron fires his first gun, the sound is heard before the gun actually fires.
Continuity mistake: At the end of episode one, when the Doctor and Taron spray paint onto the invisible Dalek, they use two different colors. At the start of episode two, the Dalek is suddenly black and painted on all sides.
Plot hole: A line of dialogue in "The Curse of Fenric" indicates that the Russians planned to make their escape by "going to the North Way", in other words, escaping to Norway. However, the story is set in the summer of 1943, when Norway was under Nazi occupation. It would not be a smart idea for any Russian military personnel to head for Nazi-occupied Norway.
Factual error: The story is set in 1943. Jean and Phyllis shouldn't readily know who Jane Russell is, as she didn't become famous until her debut film The Outlaw was a box-office hit after the war, three years later. (Although The Outlaw originally had a limited release in the US [but not the UK] in 1943, it was quickly withdrawn by the censors and not released widely until 1946.) True, they could have read about this film in a newspaper or magazine, but considering the strict wartime censorship then in force, it is unlikely.
Continuity mistake: Patrick Troughton's sideburns keep appearing and disappearing, depending on whether what is being shown is location filming or studio.
Plot hole: The energy weapons in this story fire a series of small red bullets, which cause numerous problems. For a start, the guns appear to have seven chambers, yet the bullets start from the same point; as they are separate bullets, surely the most minor of movements would mean they wouldn't emerge in a straight line. Later, when the Doctor steals a cart, the bullets are coming quite a distance towards the screen but the bullets don't get any bigger. Also, in the same scene, the Doctor passes through the area they seem to be travelling, yet the bullets just continue to pass in front of him.
Delta and the Bannermen - S24-E3
Plot hole: The Doctor says the explosion of the sonic cone will destroy everyone, so why doesn't it?
Earthshock - S19-E6
Continuity mistake: In episode four, as they approach the TARDIS, the female member of the remaining troopers is grabbed and doesn't make it inside. But when the troopers do get inside the TARDIS, it's a man that's missing.
Continuity mistake: In episode 4, the Doctor's bow shrinks from when he talks to Liz Shaw while in prison, to when he stows aboard a jeep later. In the DVD commentary, producer Barry Letts blames himself for this mistake. (00:13:00 - 00:19:50)
Revealing mistake: When the Doctor and Jo see Bessie in the middle of the rocky area, there is the white chalky substance from the ground on her wheels, indicating she was driven to the spot rather than being "transported" to the black-hole.
The Daleks' Master Plan - S3-E4
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.
Other mistake: When Marius injects the cloned Doctor and Leela into the real Doctor, the syringe is full of air, although the later graphic shows them in liquid.
Continuity mistake: When Sarah Jane is sitting on the floor inside the transparent tube and the two gold-trimmed mummies/guardians appear in the background, you can see the dust on the surface of the tube change noticeably as the fade occurs.
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