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* AssPull: "AndThenJohnWasAZombie"; somehow, the audience is left to assume that John had died and becomes a zombie, yet nothing explicit about his "death" was foreshadowed prior to that and it just up and happens at the story's climax.
* FridgeBrilliance: The collapsing ceiling that traps John can actually happen in the original ''VideoGame/{{Doom}}'' games: some crushing ceilings do not retract upward, and if the player survives the crushing part, they will be immobilized inside the architecture.
* HarsherInHindsight: John's need to kill all the demons in the fic becomes this in ''VideoGame/DoomEternal'' [[spoiler:during the {{Flashback}} sequences in the "Sentinel Prime" level, where Doomguy, having fought demons for an unspecified time after ''VideoGame/Doom64'', reached the world of Argent D'Nur and is a complete mental wreck, shouting about how he needs to "Kill them...must kill them all!", indicating how traumatized Doomguy has become from endlessly fighting demons]].
* HilariousInHindsight:
** Doomguy was never given a name in the video games, but the story names him "John"- which, by complete coincidence, is the same exact name given to him by the [[Film/{{Doom}} movie adaptation]], released three years later.
** A soldier is trapped in a losing battle that’s taking a toll on his sanity, ends up finding out from what he thinks is the voice of his commanding officer over the radio that he indeed is the true monster. This is effectively the infamous TwistEnding of ''VideoGame/SpecOpsTheLine''.
** If you squint while looking at ''VideoGame/Doom2016'' lore, you could make the case that '''[[AscendedFanon iD Software and Bethesda loosely adapted this story into that game's canon]]'''! "[[ApocalypticLog The Slayer's Testament]]" says the demons collapsed a whole temple on the Doom Slayer to keep him contained. They may well have used some demons as bait to lure him into the area, and deliberately made the ceiling fall on him. The AndThenJohnWasAZombie that followed was Hell's attempt to corrupt the Slayer, which ultimately failed. It could have also metaphorically happened when the beginning of ''2016'' has him awaken from his coffin, and "you are the demons" potentially referring to how he's become TheDreaded to even them, which The Slayer's Testament proves correct.
** ''2016'' strongly implies that the trips to Hell and back have made the Doom Slayer at least partially demonic. While that isn't the case, ''Doom Eternal'' reveals [[spoiler:Doomguy was placed in the Divinity Machine and became an EmpoweredBadassNormal, effectively turning him into the current [[PhysicalGod Doom Slayer]]]].
** Although it's no longer added, ''Eternal'' was meant to feature an "Invasion Mode", where players are allowed to be demons in another player's campaign to stop their progress. Simultaneously, the multiplayer-based "Battlemode" has one player as the Doom Slayer while the opposing team of two players can control selectable demons. Furthermore, one skin for the Doom Slayer in ''Eternal'' allows players to [[https://slayersclub.bethesda.net/en/article/5qFGqm1N32Ra2Aqw0uZB5F/the-zombie-doom-slayer-lives be a zombie]].
** The fic's WhamLine "No, John: you ''are'' the demons" takes on a whole different meaning when the ending of ''The Ancient Gods - Part One'', DownloadableContent for ''Doom Eternal'', shows [[spoiler:[[SatanicArchetype the Dark Lord]], the supreme leader of all of Hell's armies, is the AlternateUniverse EvilCounterpart of the Doom Slayer]].
* ItWasHisSled: The last three lines of the story's TwistEnding is the most quoted part of the FanFic, and [[AndThenJohnWasAZombie there's even a trope named after it]].
* MemeticMutation: According to Website/KnowYourMeme, [[http://knowyourmeme.com/memes/doom-repercussions-of-evil this story has now reached memetic status]].
* {{Narm}}: The whole thing, but "HE GOING TO KILL US" stands out.
* PlayAlongMeme: It's common courtesy to write a review of this FanFic as if it's a literary classic studied in English classes.
* SoBadItsGood: Years after the story was published, the author made it clear that it was his intent to make a purposefully-corny story full of grammatical errors. Given how this FanFic was VindicatedByHistory, he succeeded.
* VindicatedByHistory: Similar to the [[ComicBook/{{Doom}} comic book]], ''Repercussions of Evil'' is best known for being nothing more than a subject of {{Meme}}s, but there's a new-found appreciation for the FanFic when ''2016'' and ''Eternal'' took some of the story's dialogue and incorporated it into the overall ''DOOM'' lore, [[ConnectedAllAlong which ultimately tied the older titles with the modern installments]].
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