It is revealed that Laurel's mother, Dinah, lives in Central City. And as she is about to leave she says she "should be back in a flash." This is a nod to another long-running DC superhero The Flash who is based in the fictional Central City.
In one shot, a subway train passes by the camera. On the front of the train is graffiti of the letter "A" in red. This is the sign of the villain Anarky, who is primarily an antagonist for Batman in the comics.
The same neon panther that was outside the strip club in the last episode, makes an appearance in Roy's house in this episode.