* CompleteMonster: [[Literature/TheABCMurders ABC]] and [[Literature/{{Curtain}} Mr. X]]. See those pages for details.
* FunnyAneurysmMoment: The short story "The Kidnapped Prime Minister", set in 1919 and written in 1925, is about Poirot having to find the titular kidnapped Prime Minister before the Versailles negotiations start, because if he is not present then the treaty might be 'too lenient'. Of course in hindsight it's generally thought now that the harshness of the Versailles treaty played a major role in the rise of UsefulNotes/AdolfHitler.
* [[ViewersInMourning Readers in Mourning]]: Poirot is the only fictional character to receive an obituary in the ''New York Times''. Although, at least one paper did an obit for [[NewJediOrder Chewbacca]].
* RecycledScript: Some of Poirot's adventures are so good, other characters copy them.
* ValuesDissonance: "The Augean Stables" sees Poirot go to great lengths to bury and discredit accusations of embezzlement by a former Prime Minister... which happen to be true. This obstruction of justice, which involves destroying a man's career, is considered right and proper in order to defend the late Prime Minister's reputation. Nowadays Poirot would be the villain in the story.
----