Hogfather/YMMV

The book

 * Anvilicious: Death's speech to Susan about how humans need fantasies like the Hogfather (i.e. Santa Claus), or Terry Pratchett's books for example, to believe in when they're young so that when they grow up, they can believe in big fantasies like justice, mercy and...purpose. Depending on your perspective, this may even approach Broken Aesop territory, given its potential for Unfortunate Implications.
 * Complete Monster: Mr Teatime. Downey remarks on how little time it took him to prepare for the task, and Teatime tells him that he already concocted a plan for how to kill the Hogfather while lying in bed one Hogswatch Eve as a child waiting for him to come.
 * Fridge Logic: Violet the tooth fairy girl and Bilious the Oh God of Hangovers are attracted to each other. Violet compounds the Oh God's attraction by mentioning she's part of a temperance movement and doesn't drink. Where does Susan know Violet from? They've seen each other at Biers, a pub ...
 * Biers serves a rather ecclectic clientelle, and it makes sense that not all the drinks there are alcoholic (or edible by human standards for that matter). Angua goes there and orders fruit juice in Feet of Clay.
 * High Octane Nightmare Fuel: Hoo boy. Mr. Teatime.
 * Genius Bonus: Many of the computer references made towards Hex. In particular the teddy bear being removed might be a reference to the Microsoft Teddy Bear which was used as the icon for a vital file in the early windows OSs. Many users (helped by an email hoax) mistook the strange file for a virus and deleted it, with disastrous consequences.
 * Uncanny Valley:
 * The Woobie:
 * Poor Bilious. Sure, we don't feel quite as sorry for him as we do for, say, Rincewind, but the poor guy gets all the hangovers from the god of wine without ever getting to actually enjoy earning them.
 * The Cheerful Fairy. The Senior Wrangler, at least, falls for her because of her Woobie-ness. Then he becomes a Woobie when she vanishes just before he was about to get serious with her.

The movie

 * Can't Unhear It: Regardless of your opinion on the TV adaptation, Michelle Dockery and Marc Warren's performances as, respectively, Susan Sto Helit and Jonathan Teatime are probably going to be definitive.
 * Special Effects Failure: As is really to be expected, Death in the TV movie.
 * Ugly Cute: In the movie, the Eater of Socks looks like a fat, little, grey-skinned, rhino-elephant ...thing. In a good way.