Dean Koontz published a book in the 80's called STRANGERS. It was about several individuals with emotional issues who are mysteriously drawn to the Elko Diner in Elko, Nevada.
At about 35:22, when they are in the theatre, Jason says to Rose, "There's a place for us, somewhere a place for us, hold my hand and we're halfway there, hold my hand and I'll take you there, somehow," and Rose surprises him as she says with him, "Some day, somewhere." These are lyrics from the song "Somewhere" from the musical "West Side Story" by Stephen Sondheim and Leonard Bernstein.The music played when they both speak is reminiscent of the song.
When Dick is hallucinating that he's fighting Bruce Wayne, Bruce says that Dick isn't Robin anymore, he's "faster, stronger, like a bird of prey." The Birds of Prey are a team of (typically) all-female heroes in DC Comics, usually led by fellow Bat-Family member Barbara Gordon/Batgirl/Oracle. This line also serves as further foreshadowing of Dick's post-Robin identity of Nightwing.
When Dawn switches the radio for the last time before pulling over, the song "You don't own me" by Lesley Gore is heard playing. This song was also used in the film "Suicide Squad" although that version was sung by SayGrace.