Chris Chibnall described this episode as "a lovely big Earth invasion story" but different from the ones done before, as it focused on Amy and Rory's time with the Doctor and the impact of him on their lives. See more »
The cubes are meant to be completely identical and with 'no flaws' to their perfect cubic nature whatever. Just after the soldier's enter, the doctor picks up a cube and plays about with it, tossing it and turning it over in his hands. At the last moment of the shot, a dent and a line, possibly from tape meant to keep the cube together, can clearly be seen at the top of one of the cubes. See more »
[on Amy and Rory]
How long were they away?
I don't know what you're talking about, Brian.
Because they're wearing totally different clothes from earlier.
Seven weeks. I got sidetracked. A lot.
What happened to the other people who travel with you?
Some left me. Some got left behind. And some, not many but... some died. Not them. Not them, Brian. Never them.
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In theme with the story, the Doctor Who logo is filled with a faux-3D pattern of the black cubes. See more »