Crane sings a line of the song "If I Only Had a Brain" from the Wizard of Oz. In that movie the song is sung by the Scarecrow, which is also Crane's super villain name.
Mention is made of Roy Harper, who was a prominent member of the Teen Titans in the comics. He was the Green Arrow's original sidekick, Speedy, before taking on the identities of Arsenal and Red Arrow.
2 of the roads mentioned are called Kane and Keaton, references to Bob Kane (Co-creator of Batman with Bill Finger) and Michael Keaton who played Batman in the 1989 film.
Reference is made to 52nd Street. 52 is a prominent number in DC Comics, most notably the mid-2000s crossover event, 52, as well as the 2011 company-wide relaunch known as the New 52.