* FanPreferredCouple: Despite a 27-year age difference between the characters, 73 percent of Foyle’s War related fanfics found on 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 Creator/LudwigVanBeethoven is perhaps not a tactful choice given the war; it's Beethoven's Bagatelle No. 25 in A minor, "For Elise".
* RetroactiveRecognition: The show contains a near-hilarious amount of young British actors who went on to make Hollywood's A-list, particularly James McAvoy, Rosamund Pike and Emily Blunt. Also featured are the fresh young faces of David Tennant, Sophia Myles and Tobias Menzies.
* 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]].