History Fridge / AvengersEndgame

* As noted on Headscratchers page, Ant-Man can still freely use his suit despite all of the available Pym Particles being used to power the quantum tunnel. Most likely explanation for this is that the tunnel uses way more Particles than the suit (since it works by shrinking the user to subatomic levels, which is what the suit does up to eleven), meaning that one vial with exactly enough Particles for one time jump would be able to power the suit for long... meaning that, had Scott not accidentally used said vial, the suit would be useless for the rest of the movie, which, even assuming that Time Heist would still be successful, would ultimately leave him with no way to save Rhodey, Rocket and Banner from the flooded ruins of Avengers Compound, and might even cost the Avengers the battle. [[ForWantOfANail All because of one accidental button press.]]

* Somewhere in between Fridge Brilliance and Horror: Fridge Horror folder mentions many [[ForWantOfANail subtle yet very important]] events that Doctor Strange had no way of manipulating or even foreseeing (a rat that couldn't even have been born until after the Snap randomly running over the quantum tunnel controls, Scott accidentally powering his suit with one of test run vials of Pym Particles, the team sending just right people to Vormir, etc.) that would most probably lead to the Avengers failing had they happened in any other way. The fact that all of those events still happened in just the right way to lead to the one good future may seem like an extreme case of ContrivedCoincidence... and that's exactly what it is! Remember: Strange saw millions of possible futures based on what everyone does or doesn't do, and there are billions, possibly trillions more of those he didn't see. The movie confirms the existence of multiverse, so all of those futures exist at the same time -- meaning that there is a version of events where all of those random and improbable events DO happen in just the right way -- and the movie simply follows this particular timeline. The horror part? For that one single good future (and any of its branches) there are millions of those where the heroes failed -- and it wasn't even their fault, [[{{Unwinnable}} but rather happened due to a single random event they had no control over and which rendered their efforts irrelevant...]]

* Assuming that they weren't moved somewhere else beforehand, we can now count [[Film/IronMan Dum-E]] [[Film/IronMan2 and]] [[Film/IronMan3 U]] among the list of casualties when the New Avengers Facility was destroyed.
** The last we've seen of Dum-E is in ''Film/SpiderManHomecoming'', moving stuff at the newly-sold Stark[=/=]Avengers Tower. We don't know where he went after that, he may be in a Damage Control facility somewhere. But if he was destroyed in Thanos's attack, well, it's not the first home-base destruction he's been rebuilt from. Though granted, [[TearJerker Tony's no longer around to do so]]...

%% NOTE TO EDITORS: Fridge pages are Administrivia/SpoilersOff. NO EXCEPTIONS.

* There's a deep significance behind both times Tony says "I am Iron Man", especially when one considers [[{{Irony}} he's not wearing his Iron Man helmet in either scenario]]. First, they both strongly represent that Iron Man isn't defined by the mask, but by the man behind it. Second, it shows that Tony is only human (the first time he did it at the conference was done with [[{{Pride}} reluctance]] at admitting it, as opposed to this time where he does it [[HumbleHero knowing his vulnerability to the Infinity stones will kill him]], but accepting it all the same).
* Fridge Heartwarming: In a sense, Tony's lifestyle then (in the first ''Film/IronMan1'') and now in this movie [[{{Foil}} foil]] each other, making for a lovely [[BookEnds book end]] to his adventure. Both homes are next to a body of water, and both are inhabited by Miss Potts, to a varying extent. But the Stark mansion reflected Tony's pride, arrogance, [[RuleOfSymbolism above-it-all detachment]], and was only good for enforcing the bachelor life. His lake home, on the other hand, reflects his [[HumbleHero humility]], selflessness, [[RuleOfSymbolism how down to earth he's become]], and embodies the simple joy of married life and family. But both contain the high-tech tools necessary to fuel his inventive genius. No matter where he goes or what he does, he is Iron Man.

** 2. Those who feel victim to the Snap are BarredFromTheAfterlife
** 3. There is NO AFTERLIFE (for certain people anyway) in the Marvel Cinematic Universe and they undergo CessationOfExistence

* Tying in with the FridgeBrilliance about Doctor Strange's willingness to sacrifice chess pieces as part of his plan to end Thanos, he said to Tony, "I will ''not'' hesitate to let either of you [Tony or Spider-Man] die." And he meant it: Spider-Man got dusted, and Tony had to die. After Doctor Strange defeated Dormammu by getting himself killed over and over in a time loop until Dormammu agreed to bargain, he clearly developed an understanding of sacrificing lives for the greater good. He was willing to kill himself over and over to keep Dormammu from harming Earth. Unlike those who tried to keep Vision alive, Strange is perfectly willing to trade lives (some temporarily, some permanently) to stop Thanos.

* An infinity gauntlet erased away half of living beings in the universe, and another one brought them back years later. Thanos and a chunk of his army got dusted by an infinity gauntlet, meaning that it is possible, in theory, to bring back 2014 Thanos the same way that Professor Hulk brought back half of the universe. While it's unlikely to happen the exact same way, given that the infinity stones were returned, who's to say some future threat can't resurrect Thanos by some other means?

* An infinity gauntlet erased away half of living beings in the universe, and another one brought them back years later. Thanos and a chunk of his army got dusted by an infinity gauntlet, meaning that it is possible, in theory, to bring back 2014 Thanos the same way that Professor Hulk brought back half of the universe. While it's unlikely to do so the exact same way, given that the infinity stones were returned, who's to say some future threat can't resurrect Thanos by some other means?