Plot Hole: The plot continues to contradict itself when it is revealed that the SRS's plan of using the nuclear codes to blackmail the world can be cancelled with a simple fail-safe.
Revealing Mistakes: Several scenes make obvious use of a toy tank and a rag-doll Sarah.
The proportions of the robot, relative to its surroundings and the people around it, change constantly. Look particularly at when it first grows where its foot is longer then Sarah Jane and it appears about 60' high, but later it's no more then 20'. But then it goes back to 60' again when it puts Sarah Jane on the chimney, and then back and forth several more times.
Harry: Come along, Doctor, we're both reasonable men. And we both know that police boxes don't go careering around all over the place.
The Doctor: Do we?
Harry: Of course we do, the whole idea's absurd!
The Doctor: Is it? You wouldn't like to step inside a moment, just to demonstrate it's all an illusion.
Harry: Well, if you think it'll do any good.
The Doctor: Oh yes, it'll make me feel a lot better.
Sarah Jane: Doctor…
Sarah Jane: You can't just go.
The Doctor: Why not, it's a free cosmos!
Sarah Jane: The Brigadier…
The Doctor: The Brigadier wants me to address the Cabinet, have lunch at Downing Street, dinner at the palace, and write 17 reports in triplicate. Well, I won't do it. I won't, I won't, I won't!
Sarah Jane: It was insane and it did terrible things. But at first it was so human.
The Doctor: It was a wonderful creature, capable of great good… and great evil. Yes, I think you could say it was human.
Brigadier: I think just for once, we're not going to need the Doctor!
Brigadier: You know, just once I'd like to meet an alien menace that isn't immune to bullets.
Winters: You won't shoot, Brigadier.
Sarah Jane: Maybe he won't, but I will!
Sarah Jane: Doctor, you're being childish.
The Doctor: Well of course I am. There's no point in being grown up if you can't be childish sometimes.
The Doctor: The trouble with computers, of course, is that they're very sophisticated idiots. They do exactly what you tell them at amazing speed, even if you order them to kill you. So if you do happen to change your mind, it's very difficult to stop them obeying the original order. But…not impossible.
Harry Sullivan: Curiouser and Curiouser.
Doctor Who: Said Alice.
This is from Alice's Adventures in Wonderland (1865), written by Lewis Carroll. In the story, Alice changes sizes several times and is very startled by the changes.
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