The Doctor's hair alternates between being longer and shorter throughout the episode.
When the TARDIS materializes to catch River Song after she blows herself out of the Byzantium, the TARDIS' exterior is that of the Ninth and Tenth Doctors'.
Goof: When the Doctor says the TARDIS hasn't landed because it didn't make its iconic sound, River explains that it only makes that noise because the Doctor leaves the brakes on. However, in previous episodes such as "Smith and Jones", the Doctor is shown releasing the brakes before moving the TARDIS, and the TARDIS still makes the noise.
Goof: The journal says "That which holds the image of an Angel becomes, itself, an Angel", which is why the journal contained no pictures of the Angels. However, looking back at the first Weeping Angel episode (Blink), it can clearly be seen that Sally Sparrow's packet contains multiple pictures of the Angels, which she has been obsessively staring at for the past year.
In the cave where the Doctor is trapped below the Byzantium, the rocks and cliffs surrounding the ship are in the shape of the "crack in the world" from previous episodes this season.
River: (to Alastair) Like I said on the dance floor, you might want to find something to hang on to.
Amy: Aren't you going to introduce us?
The Doctor: Amy Pond, Professor River Song.
River: (gasps) I'm going to be a professor some day, am I? How exciting! (laughs) Spoilers!
Amy: So, what's he like? In the future, I mean. 'Cause you know him in the future, don't you?
River: The Doctor? Well, the Doctor's... the Doctor.
Amy: Oh. Well, that's, um... very helpful. Mind if I write that down?
Amy: Where'd you learn how to fly the TARDIS?
River: Oh, I had lessons from the very best.
The Doctor: Well, yeah...
River: It's a shame you were busy that day.
The Doctor: Lovely species, the Aplans! We should visit them sometime.
Amy: I thought they were all dead.
The Doctor: So is Virginia Woolf. I'm on her bowling team.
The Doctor: You're still here. What part of wait in the TARDIS until I tell you it's safe was so confusing?
Amy Pond: Oh, are you mister grumpy face today?
The Doctor: A Weeping Angel, Amy, is the deadliest, most powerful, most malevolent lifeform evolution has ever produced, and right now one of them is trapped inside that wreckage. And I'm supposed to climb in after it with a screwdriver and a torch, and assuming I survive the radiation long enough, assuming the whole ship doesn't just explode in my face, do something incredibly clever which I haven't actually thought of yet. That's my day, that's what I'm up to. Any questions?
Amy: Isn't there a chance this lot's just gonna collapse? There's a whole ship up there.
River: Incredible builders, the Aplans.
The Doctor: Had dinner with their chief architect once. Two heads are better than one.
Amy: What, you mean you helped him?
The Doctor: Uh, no. I mean he had two heads.
Father Octavian: An Angel on the loose amongst stone statues. Much harder than I prayed for.
River: A needle in a haystack.
The Doctor: An Angel that looks like hay. A hay-like needle. Of death. A hay-like needle of death in a haystack of, er, statues. No, yours was fine...
Amy: I don't need you to die for me, Doctor. Do I look that clingy?
Amy: So, what's a "Maze of the Dead"?
River: Ah, it's not as bad as it sounds. It's just a labyrinth with dead people buried in the walls. Okay, that was fairly bad.
The Doctor: Didn't anyone ever tell you, there's one thing you never put in a trap if you're smart? If you value your continued existence. If you have any plans about seeing tomorrow, there's one thing you never, ever put in a trap.
Angel Bob: And what would that be, sir?
The Doctor: Me.
In one of the Clerics' ships, the Doctor accidentally pulls off one of the ceiling straps. This was an actual mistake on the part of Matt Smith, which Steven Moffat decided to actually put in the episode.
The BBC received over 5000 complaints for the ending of this episode. In an intense moment, an animated Graham Norton appears on screen to advertise Over the Rainbow. Graham Norton responded by having an animated Dalek exterminate another animated version of himself on his own show.
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