The Doctor shows his ability to determine the composition of something by taste or smell much like the Tenth Doctor and the Fifth Doctor when he tastes the blue grass, much like he did in The Eleventh Hour when he tastes Amy's shed to learn he was twelve years late on his promise to return.
When Elliot asks the Doctor if he's scared of monsters, and responds that they are scared of him, this is a reference to how his reputation is enough to scare aliens away from earth. Just like the Atraxi were frightened away by their knowledge of the Doctor shown in The Eleventh Hour.
The Doctor: What are those?
Ambrose: Like you say, every little helps.
The Doctor: No, no weapons. It's not the way I do things.
Ambrose: Well, you said we're supposed to be defending ourselves.
The Doctor: Oh, Ambrose, you're better than this. I'm asking nicely. Put them away.
Nasreen: This is like every day to you.
The Doctor: Not every day. Every other day.
The Doctor: Oh, look, a big mining thing. Oh, I love a big mining thing. See? Way better than Rio. Rio doesn't have a big mining thing.
(Rory, Ambrose and Tony enter the room in which Alaya is being kept prisoner)
Alaya: You had to come and see me.
Rory: We are going to keep you safe.
Ambrose: Your tribe are going to give us back our people, in exchange for you.
Alaya: No. (walks towards others, but is held back by chain) Shall I tell you what's really going to happen, apes? One of you will kill me. My death shall ignite a war, and every stinking ape shall be wiped from the surface of my beloved planet.
Tony: We won't allow that to happen.
Alaya: I know apes better than you know yourselves. I know which one of you will kill me. Do you?
Ambrose: (about the church door) I can't open it. It keeps sticking, the wood's warped.
The Doctor: Any time you want to help!
Rory: Can't you sonic it?
The Doctor: It doesn't do wood.
Rory: It doesn't do wood? That is rubbish!
The Doctor: Oi, don't diss the sonic!
Elliot: Have you met monsters before?
The Doctor: Yeah.
Elliot: Are you scared of them?
The Doctor: No. They're scared of me.
The Doctor: Lovely place to grow up, round here.
Elliot: I suppose. I'm going to live in the city one day. Soon as I'm old enough, I'll be off.
The Doctor: It was the same where I grew up.
Elliot: Did you get away?
The Doctor: Yeah.
Elliot: Do you ever miss it?
The Doctor: So much.
The Doctor: "Restricted access. No unauthorised personnel." Hmmm. (Opens the gate with the sonic screwdriver)
Amy: That is breaking and entering!
The Doctor: What did I break? Sonic-ing and entering; totally different!
International Air Dates:
United States: 12 June 2010
Mo: But who is this creature, with terrible claws, terrible teeth, and his terrible jaws?
Mo is reading from The Gruffalo (1999), written by Julia Donaldson. The story tells the tale of a mouse that avoids dangerous animals in the forest by describing it's friend, a Gruffalo. It then discovers that the creature actually exists, but convinces the Gruffalo that it is the scariest creature in the woods.
The visors of the Silurians' masks have different scanning settings, similar to the masks of the eponymous aliens in the Predator film series.
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