According to the DVD in visual commentary of the Eleventh Hour, Steven Moffat said the TARDIS crashing scene with the Millennium Dome in the background was a mistake, at first. However, he decided to keep it in because he thought since the TARDIS is a time machine, right after the Doctor avoided Big Ben it would pop back in time to 1996.
At the very end of the episode, a clock in Amy's room is shown changing from 11:59am to 12:00pm, which should be in the middle of the day, however it is night outside. This may not be a production error, because when the clock changes to 12:00pm, the date changes as well which should only happen when the clock changes to 12:00am.
At the end of the episode it is revealed that Amy is from 2010. However this doesn't add up. At the start of "Eleventh Hour" the Doctor can be seen hanging from his damaged TARDIS above London. The O2 Arena (previously the Millenium Dome) can be clearly seen making it at least 1999. The current time Amy is from 14 years after that (as clearly stated at the end of that episode) so the earliest time she could be from is 2013.
The date on which the crack originates is the scheduled UK air date of the last episode in the series.
The Doctor gives his age as 907, which would mean four relative years have passed since the events of Voyage of the Damned.
It would also mean that one year has passed between this and The End Of Time (or he's at least had a birthday) as he told Wilfred he was 906 in that.
The Weeping Angels are seen moving on-screen for the first time. This disproves the thought that their habit of turning to stone when being observed extended beyond the fourth wall, to the viewer.
In the episode "Blink", it is said that if an Angel touches you, you get sent back in time, and the Angels feed off of the life you would have lived. However, in this episode the Angels are physically killing the group, which the Doctor begins to say (before being interrupted) is not how they usually kill.
The Doctor: It's nice in here. Consoles, comfy chairs, a forest. How's things with you?
Angel Bob: The Angels are feasting, sir. Soon we'll be able to absorb enough power to consume this vessel. This world and all the stars, and worlds beyond.
The Doctor: Well, we've got comfy chairs, did I mention?
Angel Bob: We have no need of comfy chairs.
The Doctor: I made him say "comfy chairs."
Father Octavian: Doctor, we're too exposed here. We have to move on.
The Doctor: We're too exposed everywhere, and Amy can't move. And anyway, that's not the plan.
River Song: There's a plan?
The Doctor: I don't know yet, I haven't finished talking. Right, Father, you and your clerics are going to stay here and look after Amy. If anything happens to her, I'm hold every single one of you personally responsible, twice. River, you and me, we're going to go find the primary flight deck, which is... (licks his finger and sticks it in the air) a quarter of a mile straight ahead. And from there we're going to stablize the wreckage, stop the Angels and cure Amy.
River Song: How?
The Doctor: I'll do a thing.
River Song: What thing?
The Doctor: I don't know, it's a thing in progress. Respect the thing.
The Doctor: (fighting off Amy's advances) Amy, listen to me. I am 907 years old. Do you know what that means?
Amy: It's been a while?
The Doctor: Ye... No, no, no! I'm nine hundred and seven, and look at me. I don't get older, I just change. You get older, I don't, and this can't ever work!
Amy: Oh, you are sweet, Doctor. But I wasn't really suggesting anything quite so... long-term.
River: You'll see me again quite soon. When the Pandorica opens.
The Doctor: The Pandorica? Ha. That's a fairytale.
River: Haha, Doctor, aren't we all? I'll see you there.
The Doctor: I'll look forward to it.
River: I remember it well.
The Doctor: Can I trust you, River Song?
River: If you like. (laughs) But where's the fun in that?
River: (to the Doctor) You, me, handcuffs... Must it always end this way? (said with a smirk)
The Doctor: River Song, I could bloody kiss you!
River: Oh well, maybe when you're older.
Father Octavian: We have to move, or the Angels could be here any second!
The Doctor: Never mind the Angels, there're worse things than Angels.
(the lights go out. When they come back on, an Angel has Father Octavian in a stranglehold)
Father Octavian: I beg to differ, sir.
The Doctor: Amy, you need to start trusting me. It's never been more important.
Amy: But you don't always tell me the truth.
The Doctor: If I always told you the truth, I wouldn't need you to trust me.
The Doctor: I'll be back for you as soon as I can.
Amy: You always say that.
The Doctor: I always come back.
Amy: So what's wrong with me?
River: Nothing, you're fine.
The Doctor: Everything, you're dying.
The Doctor: Yes, you're right. If we lie to her, she'll get all better!
Angel Bob: Hello, Doctor? Angel Bob here, sir.
The Doctor: Ah, there you are, Angel Bob. How's life? Sorry, bad subject.
Amy: Okay, so we've basically run up the inside of a chimney, yeah? So what if the gravity fails?
The Doctor: I've thought about that.
The Doctor: And we'll all plunge to our deaths. See? I thought about it.
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