5. You can find Sivana Industries' offices
Rocksteady's version of Metropolis is filled with many, many different references to other iconic DC characters and organizations. Case in point; Sivana Industries' offices can be found in the open-world map of Suicide Squad: Kill the Justice League. However, that's not the only recognizable company players will come across on their journey to take down Brainiac.
6. Oliver Queen's headquarters are here
Once again, excuse the misaligned photograph. Much like with the easter egg piece on Alan Wake 2, it's difficult to take great pictures in a game that doesn't feature photo mode. But what you're seeing right here is the logo of Queen Industries, the company owned by Green Arrow.
While there isn't an explicit title or sign that indicates this is, in fact, Queen Industries, it is made evident by the green logo that's composed of a letter "O" that also plays out as a "Q", with an arrow below it. Oliver Queen's initials being engraved on the logo puts in evidence this has to be, without a doubt, one of his company's buildings.
7. What happened to Sinestro?
There are many advertisements of the Metropolis East Bank scattered across the city. Funnily enough, they feature big-headed purple aliens wearing yellow costumes. While they are far from being a one-to-one adaptation of any specific DC character, they sure look like Sinestro. A member of the Yellow Lantern Corps who's well known for his purple skin color, and yellow suit.
8. Key characters could've survived the main story
Major spoilers to follow for Suicide Squad: Kill the Justice League
We wrote a dedicated article about the few secret details that could indicate the Justice League is still alive and well after the events of Suicide Squad: Kill the Justice League (which you can read here). But long story short, the Barry Allen that players kill in the main campaign has all five fingers in his left hand while the Barry from the Arkham-verse had only four due to a major injury provoked by Captain Boomerang. Maybe the Scarlet Speedster that ends up dying is from another world.
On the same page, Green Lantern doesn't bleed after being shot in the head, indicating that he could've been shot with a blank. After all, he later does bleed from the hand when King Shark cuts his finger off. These hidden details could suggest the Justice League will make a return in future expansions of the game.