Applies to the book Mostly Harmless:
- Hilarious in Hindsight: Remember when Arthur first encountered the Vogons, and wished he had a daughter so he could tell her never to marry one? In this book, he ends up with Random. Be Careful What You Wish For, Mr. Dent.
- Inferred Holocaust: The destruction of "every Earth in every reality" and all their inhabitants sounds bad enough, but it's left to the reader to realize that that includes NowWhat, the King, and probably even the dolphins. (NowWhat may be a Crapsack World, but it puts a human face on those alternate Earths and shows just how diverse they were.)
- Older Than They Think: Mostly Harmless may remind you (if you're among the older tropers) of Harlan Ellison's Deathbird Stories. Which is about as Genre Shifted as you could get from Adams' usual wild-and-crazy satire.