Idea Proposed and Used to Death during the New Series: In the entire 26-year history of the original series, there were thirteen appearances by children under twelve, only two of which were actually central to the story (OK, you could argue that Pangol in The Leisure Hive and Benton in The Time Monster were pretty central, but their screen time as children was limited). In the six-year history of the new series, we've had 22, ten of these in the Moffat Era alone (and I'm not including metaphorical children like Nephew or alien eggs like Bron, though I did include the kittens in Gridlock). Haven't we made up for enough lost time already?
Central Premise Recycled From: Really, wasn't this just Fear Her given a second draft and a change of gender?
Reference to Moffat's Back Catalogue: Vulnerable small child (in pyjamas no less) with a connection to an alternate reality; Doctor as saver of small children; father issues; creepy mechanical/doll things; nursery rhymes; "everybody lives."
Amy Screws Up the day with Wuv: Not so much this episode, probably because somebody else is screwing things up with Wuv instead.
Neil Gaiman Called...: Joss is on holiday, and Neil would like a word regarding several plot elements of The Doctor's Wife, to say nothing of Sandman: A Doll's House.
And from Lawrence Miles: Creepiness with an eighteenth-century look. Plus he invented one of those "civilisations of pure thought" that the Doctor namechecks.
Murray Goldwatch: I generally like his original songs (with the exception of "You Put The Devil In Me"), and the creepy nursery rhyme is good, though the incidental music which follows Amy and Rory around the dolls' house is a bizarre mixture of suspenseful and bombastic.
Nostalgia UK: Toy soldiers, plus the decor on the council estate has a brilliantly retro feel (although young George must be the only child on the estate whose parents buy him no branded merchandise whatsoever).
Inside Jokes: "Snow White and the Seven Keys to Doomsday"; also the Doctor refers to "empires of glass," which is undoubtedly a ref to Andy Lane's Missing Adventure The Empire of Glass (spoiler: the title refers to Venice). It's not a Doctor Who inside joke, but one of the tenants' names is Rossiter (as in Rising Damp).
Teeth! On the bulldog!
Hats! I did wonder at first what the Amy-doll was sprouting out of its head.
Fish! Not on the menu tonight, though George owns some dinosaurs.
Small Child! Erm... pass.
Item Most Likely to Wind Up as a Toy: The creepy dolls obviously, although the tragedy is that they will probably wind up as 5-inch action figures rather than actual doll replicas of the creepy dolls (although if future generations want a cool idea for a limited-edition collectible, there it is).
Title explained here.