In the final scene where the Doctor is about to use his sonic screwdriver on the duplicate Amy, the sonic screwdriver is shown in its extended mode when the camera is focused on the Doctor. However, when the camera is focused on Amy, showing the Doctor only from behind, the sonic screwdriver can plainly be seen as being in its closed compact mode.
During his initial instability, the Doctor-Ganger reverts to several previous incarnations:
- "One day we will get back, yes, one day" refers to the First Doctor, talking to his granddaughter Susan about returning home.
- "Reverse the polarity of the neutron flow" is typically attributed to the Third Doctor.
- "Would you like a jelly baby?" is a common offer from the Fourth Doctor (with Tom Baker's voice apparently dubbed in)
- "Hello, I'm the Doctor. No, let it go, we've moved on." is in the 10th Doctor's voice, David Tennant.
- The Cybermats appeared primarily against the Second Doctor, first appearing in The Tomb of the Cybermen
In the control room as the first tremors shake the factory, Amy is standing with her arms crossed, no one near her, with her back to a red stretcher. There's a brief shot of the Doctor and Cleaves at the control as tremors shake the building. When the camera instantly cuts back, Amy's arms are uncrossed, she has turned 90 degrees clockwise, and Dicken has appeared to steady her.
Despite the fact that the monastery is flooded with gas, Rory and Jennifer never notice it or are affected by it during their confrontation with the Jennifer-Ganger, or their earlier movements through the monastery. They only start reacting as they approach the thermostatic chamber.
The Doctor-Ganger: There may be a way back from this.
Cleaves-Ganger: From being vaporized? How?
The Doctor-Ganger: Don't know. Let's find out, eh?
The Doctor-Ganger: Well, my death arrives, I suppose.
The Doctor: But this one, we're not invited to.
The Doctor-Ganger: Pardon?
The Doctor: Nothing. Your molecular memory can survive this, you know. It may not be the end.
The Doctor-Ganger: Well, if I turn up to nick all your biscuits, then you'll know you're right, won't you?
The Doctor-Ganger: Rory and Amy, they may not trust both of us.
The Doctor: Are you thinking what I'm thinking?
The Doctor-Ganger: Inevitably.
The Doctor: See, I'm glad we're on the same...
The Doctor-Ganger: Wavelength. You see, great minds...
The Doctor: Exactly. So, what's the plan?
The Doctor-Ganger: Save them all, humans and Gangers.
The Doctor: Tall order. Sounds wonderful.
The Doctor-Ganger: Is that what you were thinking?
The Doctor: Yes. It's just so inspiring to hear me say it.
The Doctor and Doctor-Ganger: Hello. Sorry.
The Doctor/Ganger: But we had to establish...
The Doctor: ...a few ground rules. For later. Protocol.
The Doctor-Ganger: Protocol? Very posh.
The Doctor: Protocol between us. Otherwise...
The Doctor-Ganger: ...it gets horribly embarrassing.
The Doctor: Potentially confusing.
Amy: Well, I'm glad you solved the problem of confusing.
The Doctor-Ganger: That's not helpful.
The Doctor: She's very good at sarcasm.
The Doctor: Yowsa! An escape tunnel. You know, I'm starting to get a sense of how impressive it is to hang out with me.
The Doctor-Ganger: Do we tend to say "Yowsa"?
The Doctor: That's enough, let it go. Okay? We're under stress.
Cleaves: Can you really get the power back?
The Doctor-Ganger: Oh, there's always some power floating around.
The Doctor: Sticking to the wires like bits of lint.
Amy: Would you stop finishing each other's...
The Doctor: Sentences.
The Doctor-Ganger: No promises.
Amy: Come on, okay, how can--how can you both be real?
The Doctor-Ganger: Well, because... we are. I'm the Doctor.
The Doctor: Yeah, and so am I. We both contain the knowledge of over 900 years of memory. And it's apparent we both wear the same bow-tie, which is cool.
The Doctor-Ganger: Because bow-ties are...
The Doctor: ...and always will be.
Amy: Hang on.
Cleaves: You can't let him go. Are you crazy?
The Doctor-Ganger: Am I crazy, Doctor?
The Doctor: Well, you did once plug your brain into the core of an entire planet just to hold its orbit and win a bet.
Dicken-Ganger: You don't look good.
Cleaves-Ganger: Monsters never do.
The Doctor: This place is going to blow sky-high.
Cleaves: Exactly how long have we got?
The Doctor: An hour. Five seconds. Uh, somewhere in-between.
The Doctor: This is going to overheat and fill the room with acid. Just as a point of interest.
Cleaves: And we can't stop it?
The Doctor: Just as a point of interest... no.
Jimmy: It'll never hold up.
The Doctor: If you have a better plan, I'm all ears. In fact, if you have a better plan, I'll take you to a planet where everyone is all ears.
The Doctor-Ganger: Ha! Hello. Adam, I'm the Doctor. Well, I'm the Doctor, or Smith. It's complicated and boring. Anyway, who cares? It is your birthday.
The Doctor-Ganger: Yay! Now, have you been getting up very early and jumping on the bed?
Adam: Yes, really high.
The Doctor-Ganger: I expect chocolate for breakfast. If you don't feel sick by mid-morning, you're not doing it right.
Jennifer-Ganger: You tricked him into an act of weakness, Doctor.
The Doctor-Ganger: No, I've helped him into an act of humanity. Anyone else like the sound of that, act of humanity?
Amy: I never thought it possible.
The Doctor-Ganger: What?
Amy: You're twice the man I thought you were.
The Doctor: Dicken, remember, people are good. In their bones, truly good. Don't hate them, will you?
Dicken-Ganger: How can I hate them? I'm one of them now.
The Doctor: I needed to see the Flesh in its early days. That's why I scanned it, that's why we were there in the first place. I was going to drop you off for fish and chips first, but things happen and stuff, and... shenanigans. It's a beautiful word, "shenanigans."
US: June 4, 2011
Turkey: February 17, 2013
Amy: You know, really, there can be only one.
Referencing the often-used phrase in the Highlander movies and TV series. A subspace of Immortal humans are destined to fight each other, taking the heads of their opponents, until only one survives.