Things don't quite add up at the end of the episode. The Doctor and Amy were puked out into the ship, but at the end, the Star Whale has nothing in front of its mouth, Could the room they fell in have been ejected from the ship after the Abdicate button was pressed?
When the Doctor uses the Sonic Screwdriver to illuminate the inside of the Star Whale's mouth, the light coming from his Sonic Screw Driver is blue instead of green.
This is not Sophie Okonodo's first foray into the Doctor Who franchise; She has previously voiced Alison Cheney, companion to an alternate Ninth Doctor, in the webcast Scream of the Shalka.
At the end of the episode, there's a pull-back shot of "Starship UK". There's a crack in the hull of the spaceship. It's the same crack that was in Amelia Pond's house - in the location where Amelia's house was in Leadworth, England. It also was the same crack as the pattern shown on the TARDIS scanner at the end of the previous episode, "The Eleventh Hour".
Amy's middle name is revealed to be "Jessica".
Amy: (voiceover) In bed above, we're deep asleep. While greater love lies further deep. This dream must end, this world must know. We all depend on the beast below.
(about to be vomited out of the Star Whale)
The Doctor: Right then. This isn't going to be big on dignity.
The Doctor: Nobody talk to me. Nobody human has anything to say to me today!
Liz 10: (To The Doctor) You're a bit hard to miss, love. Mysterious stranger, M.O. consistent with higher alien intelligence, hair of an idiot.
The Doctor: (putting water glass back on couple's table) Sorry, checking all the water in this area. There's an escaped fish. (turning back to Amy) Where was I?
Amy Pond: Why did you just do that with the glass.
The Doctor: Don't know, I think a lot, hard to keep track.
Amy: (regarding the Doctor/star whale) What if you were really old and really kind and alone? Your whole race dead, no future, what couldn't you do then? If you were that old and that kind and the very last of your kind, you couldn't just stand there and watch children cry.
Amy: I voted for this. Why would I do that?
The Doctor: Because you knew if we stayed here, I'd be faced with an impossible choice - humanity or the alien. You took it upon yourself to save me from that. That was wrong. You don't ever decide what I need to know.
Amy: I don't even remember doing it.
The Doctor: You did it. That's what counts.
Amy: I'm... I'm sorry.
The Doctor: Oh, I don't care. When I'm done here, you're going home.
The Doctor: Big day tomorrow.
Amy: Sorry, what?
The Doctor: It's always a big day tomorrow; We've got a time machine! I skip the little ones.
Amy: I'm in the future. Like, hundred of years in the future. I've been dead for centuries.
The Doctor: Oh, lovely. You're a cheery one.
Amy: So, is this how it works, Doctor? You never interfere in the affairs of other peoples or planets....unless there's children crying.
The Doctor: (smiling) Yes.
Amy: My name is Amy Pond. When I was seven, I had an imaginary friend. Last night was the night before my wedding, and my imaginary friend came back.
This is the only episode of Series 5 to feature the middle-eight segment in the ending theme music.
When the voting system states Amy's name, the screen says 1,308 but the voice says 1,306.
Ark In Space: It is stated that the Earth was abandoned in the 30th century owing to solar flares. This is a reference to the Ark in Space serial from the classic series, which was built around the same premise.
Star Wars: A New Hope
When HRH Liz X is first speaking with the Doctor, imploring him for help, she finishes by saying "Help us, Doctor, you're our only hope". Just as Leia did of Obi Wan in Star Wars: A New Hope.
Star Wars: Empire Strikes Back
The last scene of the Doctor standing in front of a large window looking out to the stars and the swipe fade that begins it are reminiscent of the final scene of The Empire Strikes Back.
Just after Amy returns the booklet, there is a store sign reading "Magpie Electricals".
This is an allusion to the televisions sales store from The Idiot Lantern.
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