It's A Thing: Listen

Guess what, we found him.

Moffat-Era Tropes: Doggerel. Childhood fears. Things under the bed. “Don't blink”-style catchphrase. People being surrounded by beings they can't actually perceive. Timey-wimey. Visiting a regular character when they are a child. Monsters under the bed. The idea that humans all share some kind of collective, unconscious, defense mechanism against a particular being. Orphanages. Agism about the Doctor's current appearance from Clara, and slights against Clara's current appearance from the Doctor. Allusions to the Doctor having been a parent. Clara saving the Doctor by having a conversation with his past self. Scottish jokes. Barns on Gallifrey.

A Thing in a Thing: A monster under the bed.

The Doctor is A: fraid.

The Master Is A: bsent.

Clara Lies About: How she knows Danny's real name is “Rupert”. She also lies by omission in not telling him what's actually going on between her and the Doctor at the same time as she's on her date, and by not telling the Doctor what she suspects about her relationship to Orson.

Reasons Clara Should Drop Danny Like A Hot Potato: Because he continually interprets innocent remarks as some kind of slight on his war record, because he's self-righteous as all get out, because he's far too touchy about the fact that his real name is “Rupert,” because his dialogue other than that is a continuous stream of double-entendres, because he doesn't “do weird”, and because if she doesn't dump him, the future will have Orson. And only she will be to blame.

Child Count: Four (or five, if the Thing In Danny's room is really another child playing a prank).

The Thick of It: The Doctor masquerades as a government inspector.

It's Actually About: The benefits of the fear response. And the fact that sometimes, the monsters really are all in your head.