!!Applies to the book ''Literature/MostlyHarmless'':

* AuthorExistenceFailure: The books were technically completed, but Adams reportedly regretted the dark ending of the last book and wanted to write another. His death prevented that.
* CreatorBreakdown: ''Mostly Harmless''
* InferredHolocaust: 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=], [[ElvisHasLeftThePlanet the King]], and probably even [[Literature/TheHitchhikersGuideToTheGalaxy1 the dolphins]]. ([=NowWhat=] may be a CrapsackWorld, but it puts a human face on those alternate Earths and shows just how diverse they were.)
* OlderThanTheyThink: ''Mostly Harmless'' may remind you (if you're among the [[TroperDemographics older tropers]]) of Creator/HarlanEllison's ''Deathbird Stories.'' Which is about as {{Genre Shift}}ed as you could get from Adams' usual [[{{Farce}} wild-and-crazy]] {{satire}}.

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