History YMMV / AvengersInfinityWar

** A lot of people called that Loki's Scepter was one of the Infinity Stones based off its appearance in the ''Infinity War'' teaser. They were proven right by the object's presence in the teaser, and later in a scene in ''Film/AvengersAgeOfUltron'' that revealed this in-canon.

* LimitedSpecialCollectorsUltimateEdition: Target sold the Ultra HD+Blu-ray+Digital pack with a digipack and a 40-page gallery book, the first time the UHD version of a Disney-owned movie received such a release.

** Thanos, upon choking Loki, boasts "No resurrections this time." Sure enough, ''Series/Loki'' would reveal that that series' protagonist didn't die and come back in order to be in that show.

** Some fans agree with Thanos' perception on universal overpopulation and his goal of wiping out half of the universe, while forgetting that planets like Titan aren't well developed enough to handle huge growing populations like Earth can, and that Earth is currently having a decline in fertility rates and overpopulation isn't really much of a current issue that Thanos builds it up to be in Earth's case. [[spoiler: In fact, with how much that ''Endgame'' proves how wrong Thanos' methods were and how he doesn't seem to do any research on how Earth manages to survive with such a population that Titan can't since he's so invested in his goals makes Thanos look like an idiot with outdated beliefs, especially since his 2014 counterpart in ''Endgame'' didn't even check to see if his plan actually helped Earth.]] Furthermore, there were any number of alternate solutions he could have tried with the Infinity Stones besides simply killing half the universe at random (which isn't even a ''lasting'' solution, and realistically kills ''more'' than half the universe by collateral damage): for example, he could have made the entire universe ''wiser'' so its people would pursue more sustainable practices. This was even entered into canon in ''WesternAnimation/WhatIf'', which shows that if he encountered someone as mature and reasonable as T'Challa rather than Peter Quill, he could easily be talked out of his plan before he truly set out to accomplish it.

** People have joked that ''VideoGame/SuperSmashBrosUltimate'' overtook ''Infinity War'' as the biggest crossover in history. It can be hard to look at back when we find out that the ''World Of Light'' story mode starts as the same as the film's climax. To make it even funnier, ''Endgame''’s first trailer was released the exact same day as ''Ultimate’s'' launch.

** People have joked that ''VideoGame/SuperSmashBrosUltimate'' overtook ''Infinity War'' as the biggest crossover in history. It can be hard to look at back when we find out that the ''World Of Light'' story mode starts as the same as the film's climax.

** [[VideoGame/MetalGearSolidVThePhantomPain "Punished Cap"]] for Captain America.

** The French dub also uses "crise d'arborescence" as a pun on "crise d'adolescence" to describe Groot, well, being a [[JustForPun treenager]].

* MoralEventHorizon: See [[MoralEventHorizon/MarvelCinematicUniverse here]].

** Rocket becoming the SoleSurvivor of the Guardians and watching Groot die becomes more tragic after watching ''Film/GuardiansOfTheGalaxyVol3'', where [[spoiler:Rocket similarly watches his TrueCompanions die at the hands of a madman worse than Thanos. One could wonder if he was having flashbacks to that day]]

** Rocket becoming the SoleSurvivor of the Guardians and watching Groot die becomes more tragic after watching ''Film/TheGuardiansOfTheGalaxyVol3'', where [[spoiler:Rocket similarly watches his TrueCompanions die at the hands of a madman worse than Thanos. One could wonder if he was having flashbacks to that day]]

* MoralEventHorizon: Thanos crosses it when he throws Gamora to her death [[KickTheMoralityPet despite genuinely loving her as a daughter]] and continuing on despite having [[MyGodWhatHaveIDone been torn up doing so]], showing he [[TheUnfettered truly will stop at nothing]] to enact his mad plan to kill half of all life in the universe.

* BadassDecay: In previous films, the Hulk was considered to be TheDreaded and TheJuggernaut by everyone, and the "strongest Avenger" despite Thor's insistence otherwise. Here, he quickly gets [[TheWorfEffect worfed]] to showcase how powerful Thanos is. Granted, it ''is'' [[AuthorityEqualsAsskicking Thanos]]. But Hulk subsequently spends the rest of the film [[AchillesInHisTent refusing to go out]] and instead leaves the fighting to Banner.

* AluminumChristmasTrees: Eitri the Dwarf King is over ten feet tall, which [[ShownTheirWork actually alludes to the theory that]] dwarves in the original myths weren't literally short, but lesser mythical creatures. Christianization turned it into their iconic literal shortness.

* WhatDoYouMeanItsForKids: Oh look, a movie with all of our favorite Marvel Cinematic Universe characters joining together! Seems like a fun family outing, huh? Not only is this movie DarkerAndEdgier than your average PG-13 superhero film, but the film ends with [[TheBadGuyWins Thanos collecting the Infinity Stones and wiping out half of the life of the universe]]. Because of there being no family-friendly films in theaters the week this was released, many parents opted to take their little ones to this, ending in many children leaving the theater in tears.

* WhatDoYouMeanItsNotForKids: Oh look, a movie with all of our favorite Marvel Cinematic Universe characters joining together! Seems like a fun family outing, huh? Not only is this movie DarkerAndEdgier than your average PG-13 superhero film, but the film ends with [[TheBadGuyWins Thanos collecting the Infinity Stones and wiping out half of the life of the universe]]. Because of there being no family-friendly films in theaters the week this was released, many parents opted to take their little ones to this, ending in many children leaving the theater in tears.

* ArchivePanic: To make most of the movie, you should have watched ideally all previous 18 movies, the [[Film/IronMan1 first of which]] dates back to 2008. This gives a total runtime of over 38 hours. You could get by just on ''Film/TheAvengers2012'' (for the Tesseract, Loki's Scepter, and the Battle of New York), ''Film/ThorTheDarkWorld'' (for the Aether), ''Film/GuardiansOfTheGalaxy'' (for the Collector, the Guardians themselves, and the Orb), ''Film/AvengersAgeOfUltron'' (for the Mind Stone, Wanda, and Vision), ''Film/CaptainAmericaCivilWar'' (for the introduction of Spider-Man and Black Panther, why the Avengers have split up, and why Wanda and Vision are shacking up off the radar), and ''Film/DoctorStrange2016'' (for magic existing in the MCU and the Eye of Agamotto), but even then, you'd be missing '''huge''' swaths of information that are varying degrees of relevant. ''Film/ThorRagnarok'' and ''Film/BlackPanther2018'' are optional, but helpful, as the end of ''Ragnarok'' leads directly into ''Infinity War'', and ''Black Panther'' sets up Wakanda and its characters, where the bulk of the third act takes place. That's still, at a minimum, over twelve hours of movie-watching to understand ''this'' movie.

** The first trailer, at a bare minimum, requires audience familiarity with ''[[Film/TheAvengers2012 The Avengers]]'', ''Film/GuardiansOfTheGalaxy'', ''Film/AvengersAgeOfUltron'', ''Film/CaptainAmericaCivilWar'', ''[[Film/DoctorStrange2016 Doctor Strange]]'', and ''Film/ThorRagnarok'', since most of the on-screen action (the divided Avengers, the Tesseract, the Power Stone in the Gauntlet, Vision and the Mind Stone, Doctor Strange, Wong and the Sanctum, and the coda with Thor and the ''Guardians'') depends on the audience knowing them.

* OnlyTheCreatorDoesItRight: Presumably why Creator/JamesGunn was brought in as an executive producer to make sure the Guardians sound and act like they do in ''Film/GuardiansOfTheGalaxy'' and ''Film/GuardiansOfTheGalaxyVol2''.

** Quill takes a moment to tell Gamora she should’ve stuck with his plan, and she yells that they shouldn’t talk about this now, considering that Thanos is holding Gamora hostage. This moment should feel like unnecessary Guardians humor. Instead, both Quill and Gamora are completely hysterical as they say it, and it’s heartbreaking to see.

** More like unexpected item, but after Mjölnir got destroyed in his last solo-outing, Thor gets a new weapon - an axe called Stormbreaker. Stormbreaker's appearance is a surprise as it's comic book owner, Beta Ray Bill hasn't appeared in the MCU yet.