10ep 1 – The thick snow covering the ground in the Heathrow location footage completely fails to match the stock footage of Concorde taking off.

20ep 1,4 – Since the stairs leading down from Concorde are part of the illusion and don't really exist, how do the Doctor and co. get down to the ground without any apparent injury when they land in the past? Similarly, in Part 4, how does everyone (including all the passengers) get back into Concorde for the take-off?

30ep 1,2,4 – Hearing the loud wooden clumping sounds as the travellers move around the supposedly sandy/rocky prehistoric wasteland brings back fond memories of Vortis and other Sixties-era planetscapes. For extra nostalgia value, watch out for the creases in the backdrop representing the sky — and if you keep your eyes at the top of the screen (during episode 1) you can even see the edge of the "sky" in a couple of scenes!

40ep 1 – Having travelled about 140 million years into the past, the Doctor does a pretty good job without the TARDIS to estimate that the Concorde has landed in the Jurassic period. (Actually the Jurassic ended approx 145 million years ago, but what's 5 million years between friends?) But then he blows his geologist cred completely by saying, "We can't be far off the Pleistocene era" — whereas in fact they're over 137 million years off! The Pleistocene epoch (not "era") began about 2.5 million years B.C.

50ep 1 – As the Doctor and co. search for the original Concorde, Captain Stapley fails to prove his eyesight airworthy when he manages not to notice the missing plane straight in front of him (Tegan, who is standing further away, has no trouble spotting it).

60ep 1 – When the TARDIS is supposedly being dragged away by the passengers, it's clearly been placed on a wheeled platform of some kind — it's smoothly gliding along in a totally unrealistic way.

70ep 1-2 – Stapley and Nyssa warn the Doctor about the Plasmatons appearing behind him before they're actually visible on screen.

80ep 2-3 – Anthony Ainley has trouble getting out of his Kalid disguise.

90ep 3 – At the start of this episode, the smoke that was previously filling Kalid's crystal ball is suddenly completely gone after the Master reveals himself.

100ep 3 – Watch out for the Master accidentally activating his TCE (just as the Doctor says the line "No heroics") — so technically, Stapley and friends should be dead!

110ep 3 – Watch the door control lever during the scenes with Stapley and Bilton observing the Master's attempt to fly the TARDIS. When Stapley and Bilton first enter the TARDIS, it's in the 'down' position. Then when the Master enters, it's suddenly in the 'up' position, and he pushes it down to close the doors. Later, when the Master finds he can't make the ship work, the door control is inexplicably 'up' again — so he can slam it down and storm out!

120ep 3 – In the scene where Nyssa is about to be absorbed by the Xeraphin into their casket, she's standing in front of it glowing in a beam of pale light. While she's standing there shouting, a human hand briefly emerges from the sarcophagus, and then falls back down.

130ep 3 – When Nyssa says "It seems like we're winning" in the Xeraphin chamber, you can see the boom mike shadow on the wall behind her.

140ep 4 – The Doctor comes out of the TARDIS, telling Tegan to come with him. She runs out after him, looking back over her shoulder, and smacks right into the Doctor. He grabs her to stop her falling, but you can tell by her face how much the whole thing took her by surprise.

150ep 4 – As the Master and the passengers emerge from the Master's TARDIS, walking on what's supposedly the ground (but is actually a bendy bit of set), the top of the Master's TARDIS jiggles.

160ep 4 – When the Doctor and co. see the Master is stranded and go over to confront him, Scobie isn't wearing (or carrying) his jacket. But when the group arrives in front of the Master, Scobie suddenly has his jacket on again.

170ep 4 – When Captain Stapley's Concorde finally manages to take off from 140,000,000 B.C., we see hazy stock footage of an airborne plane imposed over the prehistoric set. While the plane is lifting off, you can see what appears to be a crow flying across the screen from right to left. Now, while crows were quite common in 1982, you'd hardly expect to see one in the Jurassic era!
[Though if I was feeling generous, I could point out that it's believed the first birds did appear during the late Jurassic era, so perhaps it could be something like an Archaeopteryx instead of a crow!]

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