The Batman: 15 Details You Missed The First Time
2. Bludhaven
At the very end of the movie in its final scene, Batman and Selina go their separate ways as the former stays behind to save Gotham while Selina deems it a lost cause and rides off to parts unknown.
Selina does offer some possible insight into where she might be going, though. When Batman asks her destination, she says, "I don't know. Upstate. Bludhaven, maybe."
It's easy to miss the relevance of what Selina said if you're caught up in the thrall of the scene or simply not a comics reader, but Bludhaven is effectively Gotham's sister city, located in New Jersey between Gotham and Atlantic City, and where Nightwing primarily operates.
There are certainly a lot of fans who would love to see an HBO Max spin-off series set in Bludhaven, so having its existence confirmed in this universe is most certainly a good thing.