Continuity mistake: When you find Gordon in the mall he's wearing his jacket. When you rescue him just after your final fight with The Arkham Knight he's not. Then he's got it back later at the asylum.
Continuity mistake: This is in the same universe as the other Arkham games yet Poison Ivy's gone from being green in Arkham Asylum and Arkham City to being just regular looking in this game.
Plot hole: In the DLC side mission In From The Cold there's emphasis put on Mr Freeze detonating the cryogenics generator he's been using in his research to take out militia tanks. Given they and almost all the icebergs explode it's amazing the Batmobile avoids instantly sinking into Gotham's waters.
Trivia: When Batman enters the clock tower, there's a flashback scene of Barbara being shot by the Joker. Before this occurs, go to the back wall and zoom in on the movie poster, "Dark Interlude." One of the names on the poster is Matthew Hagen. In "Batman: The Animated Series", Matthew Hagen was an actor who was transformed into the shape shifting villain Clayface.
Batman: I am vengeance. I am the night. I am Batman.
Question: Except for Two-Face, Killer Croc, Scarecrow and Jervis Tetch, why were the rest of the villains redesigned?
Question: Just where did the militia get the money for all their weapons and gear? The only rogue who's got good money is The Penguin, and he doesn't seem capable of necessarily funding a whole army.
Answer: All the villains financed the Arkham Knight: Penguin, Two Face, Harley, Scarecrow. This is why Two-Face and Penguin stayed in Gotham and risked getting gassed to rob banks and run guns; they'd dangerously low on funds.
Answer: The Arkham Knight is behind the whole thing. He probably financed it somehow. Given who he turns out to be, probably from stolen drug money.
Answer: Probably because different people were working on the game. Scarecrow and Croc also have different looks if you've played Asylum, City, and Origins, they look different here too.
Rob245
Croc's redesign is easily explainable as it's revealed in this game that his mutation is accelerating.