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.
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.
Batman: I am vengeance. I am the night. I am Batman.
More trivia for Batman: Arkham Knight
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: 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: 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.