On Themyscira, one of the hazards involves the victim smashing into a statue, falling down a stone stair, burning after knocking over a lit brazier, smashing into several branches and then finally getting crushed by the statue's head exactly where they land. With such poor luck for the victim, it's a ridiculous Contrived Coincidence until you remember that the Amazons are supposed to keep the fires in the temple burning or they will suffer bad luck. Remember that brazier?
How come in the story the heroes always beat their Regime counterparts, including the heroic Batman? Well, just ask Ares, who the Regime had so deprived of conflict he began to lose powers. Essentially, Regime members and its opposers became kinda rusty from not directly fighting in a long time.
It seems a little far-fetched that Superman would go this far off the rails. Or that the Joker would ever pull off nuking Metropois. I mean, Lex would NOT allow that, at least without his permission. In the Injustice universe, however, Lex Luthor is a good guy. That simple fact is the butterfly effect that causes everything else, as without him Superman didn't face anyone willing to attack his psychological weaknesses as viciously, and there wasn't one villain who "ruled" Metropolis and kept interlopers out.
It seems quite unbelievable that Luthor would allow Metropolis to be destroyed in such a manner, which he is indeed planning at the start of the game. But Superman Returns has Lex planning to drown the entire city, and a large chunk of the United States for the sake of controlling the real estate market.
Batman's Classic Battle ending has him inherit Luthor's fortune & use it to revitalise Gotham & Metropolis, with his actions as Batman fighting the One Earth regime leading to the crime rate dropping & allowing him to focus on the rebuilding efforts. In other words, after years of fighting in their memory, Bruce gets to rebuild two cities in the manner his parents had revitalised Gotham before their deaths.
A major complaint about Yellow Lantern is that he doesn't sound threatening. Remember, however, that it is vastly out of character for Hal Jordan to willingly join the Sinestro Corps, and the Story Mode establishes that he doesn't have the backbone to stand up to for what he believes (Green Lantern even mocks him for this) — Hal doesn't sound intimidating simply because he's trying to hide the fact he's a coward.
Most of the time, it doesn't make sense story-wise for the background cameo characters to be standing around in the middle of a fight. However, in the Penitentiary on Stryker's Island, Deadshot can be seen hiding behind a pillar, exchanging shots with an unseen enemy. Considering that a massive battle between Insurgency and Regime forces happens on the Island during Chapter 8, and since it's established that mercenaries and former villains comprise the Insurgency, Deadshot is likely assisting the heroes.
Why does Superman's unborn child's grave read "Baby Kent"? He was too grief-stricken over the deaths of Lois and the baby to go through with naming his child, whose gender he didn't know to boot.
Green Lantern threw Solomon Grundy in space in Chapter 5. Remember that. Fast forward to either Chapter 8(Batman) or 9(Lex Luthor). Grundy was nowhere to be seen. That is, until Chapter 10. How did he get to the Fortress of Solitude, while being in space? Simple. When the Watchtower went boom at the end of Chapter 8 and close to the end of Chapter 9, the Watchtower's visible-from-land explosion forced him back, and his zombie nature allowed him to survive heating up upon reentry, whereupon he was found by some Regime member and taken to the FOS. And you know what the best thing about it is? Slade indirectly caused this by rigging the tower in the first place.
How can Superman defeat the High Councilor? Simple. Notice how pale the High Councilor is, and Ares' remark about there being next to no conflict: The High Councilor hasn't had to actually step out from his fortress and fight somebody, and because he doesn't get enough sun, he is weakened and beaten into submission.
Given the premise of the story, this is one of the few games where alternate skins based on the depictions of characters in other DC properties and comics makes complete sense. The Alternate Universe plot-line means you can literally view the skins as exactly what they are intended to represent, rather than merely being the game characters with a different look. Perhaps best demonstrated by the Green Arrow skin from Arrow, where the actor from the show, Stephen Amell, voices him, instead of Alan Tudyk.
In the iOS version of Injustice, you can get Prison Superman and Batman Beyond. Both of these characters share vastly lower stats compared to their Normal and Regime/Insurgency counterparts, respectively. For Batman Beyond, compare 850 Attack and 900 HP to Normal Batman's 700 Attack and 1100 HP; and for Prison Superman, compare 700 Attack and 800 HP to Regime Superman's 900 Attack and 1100 HP. This makes sense because both BB and Prison Supes are inferior/hindered by some way in their characters. Bruce only wears the Beyond suit once he's middle aged & his body's starting to fail him, and Superman is hindered by the wristbands he wears, as well as his exposure to red sun. So, in a way, these lower stats make total logical sense and are justified.
Additionally, the Regime versions of Solomon Grundy, Doomsday and Bane are weaker than their main-universe counterparts, likely due to their brainwashing. The Regime version of Cyborg is much more powerful than his heroic self likely due to upgrades. And the Regime versions of Wonder Woman, Nightwing, Black Adam, Green Lantern, and The Flash, as well as the "Insurgency" Joker, are all more powerful than their main universe selves—because they're all shown as willing to go to extremes that their counterparts won't.
While this piece of Brilliance might be obvious to those who pay attention, Insurgency Batman mentions early on that "most obey Superman by fear." Now, why else is there a tall, pink alien representing the yellow light of fear on Regime Superman's side?
The deliciously bitter irony of the fact that Shazam saves Superman from Luthor just before Supes kills them both for their trouble is Fridge Brilliance at its finest.
Flash and Shazam are nicknamed Those Two Guys because they are often seen together. This makes perfect sense because they are the two most critical of the actions taken by the Regime. Had it not been for the High Councilor murdering Shazam in cold blood for his outspokenness, the Insurgency might have had two heroes defect to their cause instead of just one.
Some people think that the Atlantis Archivist giving away info of Regime Superman's uprising to Normal Aquaman is rather stupid since both Aquamen are completely different both physically and in personality. However, with the addition of Martian Manhunter as DLC, and it being explained in his ending that he was in disguise as such Archivist it takes a whole new meaning as Martian Manhunter probably saw him and thought: "Hey, this guy isn't so bad, I'll spill my beans to him."
Why does Damian Wayne keep Dick's name of Nightwing rather than a new super identity, especially one so closely associated with the outlawed Batman? Because Nightwing was originally the name of a a Kryptonian Superhero and the Superman supporting Damian is taking it back.
Equal parts Fridge Brilliance and Fridge Horror for a small detail concerning the alternate universe plot. Although this can be shot down by the fact that DCU games and movies are very separate, it can count. On Joker's character tab for The Dark Knight, his The Unfettered entry says that he has no limits of any kind. Remember that in the Downer Beginning to Injustice, "Faux Insurgency" Joker nuked Metropolis. Brilliant for the fact that Insurgent Joker could have taken cues from Nolanverse Joker, and Horror for the same reason, and also Horror for the fact that Insurgent Joker may repeat any of Nolanverse Joker's acts of crime. If you really want to start thinking, start applying this logic between Nolanverse Bane and Catwoman or Snyderverse Superman and Zod.
What does Insurgency!Luthor say that causes Regime!Superman to loose it and kill him? "Your "peace"...is a joke!" A JOKE.
Fighting in the Batcave results in many a rock falling down onto the arena, particularly if a Clash takes place on the upper level. Now what are the ramifications for Wayne Manor, which is directly atop most of this? This also begs the question of where Alfred is. Did he evacuate when all the rumbling started, is he trapped under a bunch of rubble, or did he fall to his doom through that massive hole you just caused?
Superman revealed Batman to be Bruce Wayne, who was subsequently made a non-person, and as seen in the game, Wayne Manor was abandoned aside from a few members of New Regime stationed there to make sure Batman doesn't try to get to the cave. Given the state of the Injustice world, it would seem highly unlikely that Alfred is still alive as he would make an awfully tempting target for Batman's enemies.
One of the creatures in the Fortress of Solitude's zoo is a starfish alien that is no doubt Starro the Conqueror. In a tiny little ball that anyone can pick up, right next to the "combat strip." Using this stage interactable will smash it into your opponent, freeing him in the process; after flopping around for a moment, he hops offscreen and disappears. Who knows what horrors have been unleashed just for a little extra damage?
Regime Raven is not seen anywhere when the Regime falls and most of its members arrested. Assuming she wasn't arrested offscreen by the Amazons, that means that we have someone seeking to bring forth the The DCU's equivalent of Satan still roaming free and capable of completing that goal. Given that the mainline heroes eventually return to their universe, there will be no one to stop Trigon's potential return.
Doomsday still appears in the background of the Fortress of Solitude, even if he is part of the match (may include a Mirror Match). There is also the matter of Doomsday serving the Regime, whose leader he has tried to kill before. Then again, making clones of him are not impossible. If that would have been the case, and Superman was a bit wiser...
They do establish early that Doomsday was uncontrollable without brainwashing, and they manage to find a way to successfully control him.
Black Adam picking random cars from the traffic and throwing them at Good!Superman, who proceeds to blow them up with heat vision.
Superman killed a child. A superpowered child, but a child nonetheless.
Doomsday has one line in story mode- "I live to kill you"- that he says to Superman. He says this while controlled by a collar made by the High Councilor. So either Doomsday, while being Mind Raped, struggles through just to let Superman know that he's relishing this fight, or the High Councilor is saying that through him. That's Luthor levels of obsession.
Regime Supes' didn't know Superman had been brought to "his" world yet, if the dialogue after the Doomsday fight is to be believed, since he "knew they'd pull you over eventually." Which means he didn't know. Yet. So the first option seems more reasonable.
Regime Superman takes over the world. Sure. How does he change the rest of the world in the process? Nations like the Middle East, and Africa may suffer the same problems Real Life has, and he just elects to place guards everywhere, possibly altering the culture of these countries? If one line of speech is to be believed, individual states still exist(Luthor mentions Kansas beef), but how has he altered their way of living? Surely not for the better, since they are being watched and Supes is practically A Nazi by Any Other Name.
In issue 35, Superman breaks Batman's back Bane-style.. Assuming Batman has the perfect memory he has in the comics (even without it, I guess it would be enough trauma) and has been on the receveing end of a Knightfall-type event, you just have to imagine what went through his head right before the deed is done.