Colony in Space:

10ep 1,6 – When the Brigadier walks to where the TARDIS has dematerialised from and tells it to "come back at once", luckily for him it reappears in a different corner of the room!

20ep 1 – Jon Pertwee has pronunciation problems again: "We're outside the space/time continny-um."
[See Inferno]

30ep 1 – The TARDIS doors are wide open when the Doctor and Jo leave to go exploring, but they're slightly ajar when the primitive is sneaking around a minute later. Then when the group of primitives tip over the TARDIS and drag it away, the doors are completely shut!
[Clearly the Doctor installed some kind of Gallifreyan anti-theft device... though that didn't stop the TARDIS itself getting stolen!]

40ep 1 – The story is set in the year 2472, but at one point, Mary Ashe says that the colonists left Earth "back in '71". Odd thing to say, considering "'71" was only a year ago — why didn't she just say "we left last year"?
[Obviously Malcolm Hulke wanted Jo to confuse 1971 and 2471 so he could establish the year the story's set in.]

50ep 1 – In the Leesons' dome, we see a wall calendar with the date Monday, 2 Mar 2472. Well, the production team only had a 1-in-7 chance to get it right, so we can't blame them too much for guessing wrong — 2nd March 2472 will actually be a Wednesday.
[Barring radical changes to the calendar system in the meantime!]

60ep 1 – When the Doctor tells Winton, "Whatever you saw can be destroyed", there are a few frames missing, causing two of the colonists moving in the background to abruptly change positions.

70ep 2 – When the Doctor meets Caldwell (the moustached IMC surveyor) at the start of episode 2, he persuades the Doc to accompany him back to his ship. Whereupon they both head towards the IMC "jeep" waiting outside, and without a word from either of them, Pertwee gets into the driver's seat and they drive off. But think about it for a moment — Caldwell and the Doctor have only just met, and the jeep belongs to IMC. Why is the Doctor doing the driving?

80ep 2 – As the IMC crew watch the Doctor and Caldwell drive towards their ship, Morgan remarks "Look, Caldwell's found us a colonist — I wonder why he's wearing fancy dress?" (referring to the Doctor's attire). But over his shoulder, we can see the monitor he's looking at while he says this, and the jeep is still way off in the distance — it's tiny! How on earth can he see what the Doctor is wearing?

90ep 2 – Watch out for some minor CSO goofs — there are at least two brief occasions on board the IMC ship when a blank blue screen appears in the background instead of the ship's monitor. One is when Caldwell, Morgan and Captain Dent are arguing about the accidental death of the two colonists, and the other is several minutes later when Morgan and Dent are discussing the identity of the Doctor.

100ep 3,5 – One of the IMC crew members (played by Pat Gorman) seemingly undergoes a rapid lifestyle change, as he grows a moustache and becomes a colonist within the space of two episodes! In episode 3, he's the IMC crewman that Captain Dent tells to "close down all systems" after the IMC ship lands. Later, in episode 5, he's the colonist that Winton tells to escort the Adjudicator back to his ship.

110ep 3 – As Winton is chased by the IMC guards to Caldwell's camp, his face and hair get covered with dust and grime. In the next scene, inside Caldwell's tent, they are suddenly clean again.

120ep 5 – When the Master spots the Doctor and Jo sneaking around in his TARDIS, he knocks them out with what he later describes as "a simple sleep gas". Afterwards, he adds "Mind you, I could just as easily have used a lethal one". So why didn't he? He was all set to kill the Doctor a little while earlier (at the end of episode 4), and he only found out about the Doctor's usefulness (his knowledge of the primitive city) after he released the gas!

130ep 5? – At one stage, the Master forces the Doctor to try and open the door to the Primitive City, when he finds the IMC are trying to rescue Jo. As he's about to release the poison gas, the Doctor kicks him, knocking the laser gun and the control out of his hand. They are then surrounded by Primitives, who take them inside the city, leaving the laser gun outside. Later, when they escape from the room with the frieze, the Master has his gun again.

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