|This story needs more crystals.|
Moffat-Era Tropes: "The Ark in Space" reference (Bennett oscillator); alien that appears malevolent but actually just wants to be loved; traveling in the Tardis as some kind of emotional therapy for needy children; fairy-tale presented as (really preposterous) science; Timey-wimey (the return of the “Pyramids of Mars” idea of events being in flux); female military types who speak in monotones; skeleton in a space suit; “Everybody lives!” speech from the Doctor; sour grouch regaining an appreciation of the beauty of life thanks to the Doctor's intervention. It's not a Moffat Trope, but it's worth pointing out that the design of the mites is awfully close to that of the red-striped giant spider on the 1978 edition of the Target novelisation of “Doctor Who and the Planet of the Spiders.”
A Thing in a Thing: A space chicken in the moon.
The Doctor is A: Man who normally helps. At least, that's what Clara says.
The Master Is A: voiding this week. Evidently the sheer level of Science Fail is too much for her.
Clara Lies About: Courtney being special. Fact is, Courtney, however important she may be to the people around her, is nonetheless one of several billion human beings, and, even if she winds up as Dictator of the Solar System, she will be forgotten within a few thousand years of her death. Telling her she's special is just catering to some kind of entitlement mentality at best, and implying that some humans are superior to others at worst.
Reasons Clara Should Drop Danny Like A Hot Potato: Once again, it's all about him: he can't just listen sympathetically to Clara, he has to wrench the conversation round to being about him leaving the army.
Child Count: 28 (13 in the opening scene, 12 in the closing scene, Courtney, and two space-chicken embryos).
The Thick of It: The Doctor tells off Lundvik for swearing in front of children.
It's Actually About: Where to begin? It's about how if the majority votes for something you disagree with, you go ahead and do what you want anyway (a lesson Courtney is sure to take with her into the Oval Office); it's about how kids need to be told they're special, otherwise they'll start drinking White Lightning; it's about how the potential life of a single space-chicken is more important than the actual lives of billions of humans; it's about the Doctor being an arrogant manipulative bastard to Clara. Take your pick.