* AdaptationDisplacement: Nobody has heard of the book (''Literature/MakeRoomMakeRoom'' by Creator/HarryHarrison), but most people have heard about the movie, or at least "[[{{ItWasHisSled}} It's people! Soylent Green is people!]]" Which, incidentally, isn't in the book -- it's just a straight-up CrapsackWorld.
* {{Anvilicious}}: If we don't do something about the overpopulation we're all going sleeping shoulder to shoulder in the streets and stairwells, until we're turned into green biscuits!
** Keep in mind that the movie was made in the 70's. [[ValuesDissonance Birth control had only been legal for a few years and nobody took environmental protection seriously.]] You could argue that this movie was a [[SomeAnvilsNeedToBeDropped well-needed slap in the face.]] A self-''defeating'' prophecy, perhaps?
* CultClassic
* FridgeHorror: Sure on the surface the film may look like a silly, dated 70s sci-fi flick but the core idea, [[spoiler:making food from people in a desperate, last ditch effort to save the human race by making food from the most abundant source - people]] is still undeniably horrifying.
* FridgeLogic: [[Headscratchers/SoylentGreen Lots of it]].
* HarsherInHindsight: Roth's suicide. The actor playing him, Edward G. Robinson, was dying of cancer. Only Heston knew. And because of this, [[EnforcedMethodActing Heston's tears were]] ''[[EnforcedMethodActing real]]''.
** [[http://www.lifenews.com/2011/08/11/china-businesses-sell-aborted-babies-as-stamina-booster-pills/ It may have come true.]]
* ItWasHisSled: Soylent Green is people. Like "[[Franchise/PlanetOfTheApes it]] was EarthAllAlong", It's now possibly the world's most poorly guarded secret, and has been parodied almost universally in Sci-Fi comedies and plenty of other places too.
** It certainly doesn't help that the [[TrailersAlwaysSpoil trailer spoiled it]].
** ''WesternAnimation/TheSimpsons'' worked it into an episode about Homer and Marge's sexual relations. [[spoiler:"It's people! People have soiled our greens!"]] A look into the future also had Homer saying "Mmm...Soylent Green."
** ''WesternAnimation/{{Futurama}}'' has Soylent Cola. The taste "[[DoubleEntendre varies from person to person.]]"
** In ''TabletopGame/{{Paranoia}}'', low clearance citizens have to make do with Soylent Red. They only get the Green stuff when they advance up the ranks.
* MemeticMutation: "It's people! Soylent Green is people!"
* NightmareFuel: "Soylent green is made from people!"
** The scoops. Imagine Trash Trucks converted with Bulldozers designed to scoop up the rioting populace. On the outside it seems like an important safety feature. However after the twist ending was revealed, it seemed that Thorn's prediction of the people being used as cattle came true.
* {{Squick}}
* StrawmanHasAPoint: Considering the state of the world, it makes ''perfect sense'' to recycle human matter into food. Many critics have noted that Thorn's rant was silly.
* TearJerker: Sol Roth's suicide.