One of the best and least appreciated aspects of Batman: Arkham Knight is how reactive and dynamic Gotham City and its NPCs are. Players encounter many NPCs with whom they don't have to interact within the GCPD headquarters, and the dialogues of these characters are related to the ongoing events of the story. For instance, players receive different reactions depending on whether they choose to shoot as GCPD officer Owens.

While the game allows interaction with members of the Bat-Family in the Arkham universe, it turns out that an animation doesn't actually reflect a real interaction of the character. On the 11th anniversary of Batman: Arkham Knight, a Twitter/X user shared a beloved interaction between Batman and Robin that players already know: when Batman crouches, Robin crouches too; however, when Robin crouches, Batman does not.

Former Rocksteady developer Aadit Doshi explained that this situation is a design flaw. Doshi emphasized how interesting this situation is by stating, "Half of the game is in the player's imagination." Since Mark Hamill's Joker dies at the end of Batman: Arkham City, he only exists in Batman's mind as a result of excessive exposure to Scarecrow's fear toxin.

Another Rocksteady developer, Paul Denning, mentioned that he was surprised when he heard this situation was a bug. Tim Drake's Robin can no longer mimic Batman when he crouches, as he is killed by a Batman clone created by Brainiac in Suicide Squad: Kill the Justice League. Whether Rocksteady will make another Batman: Arkham game remains uncertain.