Often times considered the best super hero video game released. Batman:Arkham Knight holds true to many subtle details in the franchise. Many iconic villains attempt to stop and fight Batman, but one we never see pictured is Deadshot.
Deadshot is an iconic villain in the Batman series, but not in the Arkham games. That is not too say that this villain is not trying to bring down the Bat in other ways. His name is engraved on every RPG that is fired out of the tanks throughout the series.
Entering photo mode while being fired upon in the Batmobile will show these engravings. Nearly impossible to see while normally playing the game. This is a subtle nod that even if not pictured or show that Batmans villains are constantly trying to bring him down. Even if it means supplying other villains with the assets to do so.
With how subtle this is, it adds an interesting dynamic when looking into the world of Batman. Without even realizing, we can see how the world around him truly wants him defeated by any means.