Alan Burnett came up with the idea to start the episode off with Bruce Wayne's last night out as Batman.
One of the Jokerz threatens Terry saying "let's put a smile on his face" is later said as a catchphrase by the Joker in The Dark Knight (2008).
The abducted girl at the beginning is Veronica Vreeland's daughter.
When Bruce vows "Never Again", it comes from Frank Miller's The Dark Knight Returns.
Though not directly stated, Bruce Wayne's final fight as Batman takes place twenty years after Batman: The Animated Series (1992) and The New Batman Adventures (1997) (and ten years after Justice League (2001) and Justice League Unlimited (2004)).