* FanPreferredCouple: Despite a 27-year age difference between the characters, 73 percent of Foyle’s War related fanfics found on Website/FanFictionDotNet as of the beginning of 2012 romantically pair Christopher Foyle and his driver Samantha Stewart.
* GeniusBonus: Or at least a bonus for the musically literate. A piano piece that is heard several times in "Elise", associated with the episode's title character, is not identified beyond a remark that Music/LudwigVanBeethoven is perhaps not a tactful choice given the war; it's Beethoven's Bagatelle No. 25 in A minor, "For Elise".
* NightmareFuel: The effects of anthrax, in both its deliberate testing on livestock and its accidental spread to humans.
** Also the [[spoiler:coffin factory]].
* RetroactiveRecognition: The show contains a near-hilarious amount of young British actors who went on to make Hollywood's A-list, particularly Creator/JamesMcAvoy (who is best known for portraying the younger [[Characters/XMenFilmSeriesProfessorCharlesXavier Professor Charles Xavier]] in the ''Film/XMenFilmSeries''), Rosamund Pike and Emily Blunt. Also featured are the fresh young faces of Creator/DavidTennant, Creator/SophiaMyles and Creator/TobiasMenzies.
** The show has also featured older, already well-respected actors who have since become more familiar to general audiences through higher-profile roles--most notably Creator/CharlesDance and Creator/PeterCapaldi.
** When Foyle begins deconstructing Reginald Walker in "War Games," the gold box from Germany is the linchpin. [[spoiler:As soon as his narration voices over a flashback to his visit to a rabbi, you know that the box belonged to victims of the Holocaust--a Jewish family who used it to hold their prayer book before they were shot by the Nazis, and it was given as a sickening gift to a family who, according to Foyle's barrister friend, were more virulently anti-Semetic than even most Nazis.]]
** All of Dr. Novak's plot in "Broken Souls."
** The deterioration of [[spoiler:Captain Kiefer's]] character, from [[ReasonableAuthorityFigure his first appearance]] in "Invasion" to [[ShellShockedVeteran his return]] in "All Clear." The glimpses we get of how this happened don't help a bit.
* SomeAnvilsNeedToBeDropped: In "A Lesson in Murder", Foyle and Sam investigate a factory where one of the suspects works, which is heavily guarded and under tight government security. It turns out to be [[spoiler: a factory run by the Ministry of Health for mass-producing wooden coffins to deal with the expected homefront casualties.]] You can almost see the anvils falling, but the effect is [[NightmareFuel chilling]].