The general idea of the series involves taking moments and clips from The Simpsons and giving them a darker context.
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General
- Homer's nickname "Mr. Plow", as well as the catchy jingle he sings, are canonically attributed to his brief stint as a famous snowplough driver. Everything related to the Dark Simpsons version of Mr. Plow, on the other hand, is generally associated with Homer "plowing" Bart whenever he feels like it.
- Multiple episodes have Superintendent Chalmers tell Principal Skinner that "The whole town is in an uproar over [Skinner's] sleazy shenanigans", referencing his relationship with Edna Krabappel. In Dark Simpsons, his sleazy shenanigans range from having sex with Willie to wanking off in front of the school.
- Homer's "Ohhhhoh, yeeeess" originally came from "The City of New York vs Homer Simpson", during the scene where Homer finally goes to the toilet after holding it in for so long. The sound clip of the scene is often used during scenes of sexual pleasure.
- Marge's hyperventilation in "Fear of Flying" originally happens during a panic attack during her first attempt at a flying trip. Like Homer's "Ohhhhoh, yeeeess", the clip is often used in video to represent Orgasms.
Episodic
- In "Penny-Wiseguys", Homer's Anvil on Head moment happens apropos of nothing and is just a throwaway gag. In "Homer Simpson vs. Sideshow Bob", however, it is integrated into the plot — Sideshow Bob drops the anvil on Homer as revenge for thwarting his attempt at murdering Bart earlier that year.
- In "Brother from the Same Planet", Marge helps Lisa break her habit of calling an expensive hotline, at one point telling her, "Lisa, the only way you'll lick this is one day at a time." In "Marge Gets Her Sax Blown", she uses the exact same line while drunkedly having sex with Lisa.
- Likewise, Lisa telling Marge "I'm gonna tell every psychiatrist I ever go to what you did!" originally comes from the episode "Pay Pal", in which Lisa is horrified to discover that Marge was paying a girl to be Lisa's friend behind her back. The same line was recontextualized into Lisa saying once Marge finishes her dirty deed the first time.
- During the Simpsons' VIP experience at a hockey game, Homer's mocking of the people below him causes Moe, Barney and Otto to form a human tower to try and get to him, only for Homer to dump a pot of hot fudge on them in response. In both versions of "Hot Fudge", the scene of Homer grabbing the pot is replaced of footage of him dropping his pants, and then loudly grunting and straining, with the rest of the scene unchanged.
- In "Black Eyed, Please", Ned's line "Come on, Homer! I'm insisting on a fisting!" meant that Ned wanted Homer to punch him because he punched Homer earlier in a fit of rage, regretted it, and wanted things to be even between them. In "Ned Is Lonely", when Ned says the line, it's because he was lonely without Maude and wanted Homer to, well...
- The original context of Principal Skinner saying "It's wanking time" was after Bart said "Everybody knows that the first day of school is a total wank" and Skinner thought "wank" meant "educational fun" for some reason. In "Skinner's Sleazy Shenanigans", "wanking time" is...more literal.
- "My Big Fat Geek Wedding" has Willie think he's shredded a child with his tractor, even though it was actually a dodgeball. In "Bart Runs for Class President", he really did shred a child (namely, Bart).
- Groundskeeper Willie yelling at Principal Skinner for "using" him originally came from the Season 6 episode "Bart's Girlfriend", where Willie was used as an Unwitting Pawn for a sting operation against Bart. In "Skinner Loves His Willie", Willie feels used by Skinner after the latter fired the former to protect his job after word got out about their "sleazy shenanigans".
- Moe bidding "half a buck" was originally for Krusty's bed (after he got busted for tax evasion and his stuff was auctioned off). In "The Simpsons Lose Their House", Moe bids the same amount for the Simpsons' former home.
- Marge discovering Lenny in a lonely, nearly empty apartment, and the latter asking her to "Please don't tell anyone how I live" was a brief one-off gag during the episode where Marge became a realtor. In "Marge Tells Everyone How Lenny Lives", Marge does exactly just that and Lenny gets his revenge.
- Homer's head going "pop" was a hilarious embellishment of the story of Maggie's birth by Bart. In "Homer's Plant Physical", Homer's head blew up because of a chip Mr. Burns implanted in his brain during said physical.
- Homer screaming "Aah! Cobras!" happened during one of his night terrors in "The Parent Rap". In "Whacking Day Cobras", he screams the same line while the cobras, who were being brought to the Simpsons' house to protect them from hunters, ended up biting him.
- "Bart Breaks Grampa's Teeth" takes the line "Since you broke Grampa's teeth, he gets to break yours" from "Itchy and Scratchy: The Movie" and has Grampa act on it, instead of Marge stepping in and giving Bart a more reasonable punishment.
- "Homer at the Bat" has Mr. Burns give Smithers 24 hours to find living, professional softball players to trick out his regular team with. In "Lenny and Carl Get Laid Off", these 24 hours are given to Waylon for the sake of killing off Lenny and Carl For the Evulz.
- In "Homer Simpson In Kidney Trouble", Homer makes Marge promise him that she will blow up the hospital if he dies during the operation (which Marge reluctantly agrees to, since she gave her word), though he doesn't die. In "Homer Gets Into a Street Fight", Homer does die, and Marge goes through with her Rash Promise.
- "Lisa on Ice" has Homer jokingly threaten to kill Bart if he loses a hockey game, and even when he intimidates Bart, it's more a gag of him being a jerk than something completely serious. In "Bart at the Bat", after Bart loses an important Isotopes baseball match... let's just say Homer wasn't joking.
- "Lisa the Iconoclast" has Comic Book Guy warn Homer not to steal his movie idea. Homer promises he won't, but then makes a mental note to steal his idea anyway. What was originally another brief funny gag becomes the main plot point in the Dark Simpsons episode "Homer Steals Comic Book Guy's Idea", in which Homer does exactly that, resulting in CBG punching Homer out, and Homer getting his revenge.
- Marge's line "Go back to your own country!" was originally directed at The Count from Sesame Street. In "For No Reason, Here's Apu", Marge says it to Apu instead.
- Originally, when Homer caused a ruckus at the cinema and Hans Moleman tells him to be quiet, Homer retorts "Don't like it, call the cops!", resulting in Moleman leaving while Homer continues to laugh. In "The Simpsons Football Short", Moleman does call the cops, and Homer gets revenge by hitting him in the groin with a football.
- Homer mentally singing "Dah, dah, dah-dah-dah, hey!" was originally just another case of him being a Cloudcuckoolander with a low attention span. In the Dark Simpsons episode "Homer Takes the Babysitter Home", he sings this to himself as a victory chant after he successfully framed Bart for sexually assaulting Ashley the babysitter and got away with it.
- In "Last Exit to Springfield", "It was the best of times, it was the blurst of times" was written by Monkeys on a Typewriter whom Mr. Burns wanted to write a great novel. In the Dark Simpsons episode "I'm Mr. Burns, Blah, Blah, Blah", it was written by Homer, and it was his report on the accounting department. No wonder Burns was pissed.
- "The Haw-Hawed Couple" has Nelson telling Bart that "[they] need to talk!", in terms of the lonely bully trying to apologize to him for going bonkers over Bart hanging out with Milhouse instead of him. "The Story of Nelson Muntz" has this line used in a less-than-innocent context involving Nelson kidnapping Todd Flanders, disguising himself as him with what's implied to be his skin, and stealing his place as the youngest of the Flanderses.
- Bart happily chanting "Knife goes in, guts come out" originally occurred in "Thirty Minutes Over Tokyo" while gutting fish with the rest of his family to earn enough money for a plane ticket home. In "Bart is a Sociopath", he chants the same thing while disembowelling the cat.
