A comic story, Batman: Gotham Adventures #4 sets up the "Lost Year", published to coincide with this series explains why Selina Kyle has black hair instead of blonde (as she did in Batman: The Animated Series (1992)). Apparently, she's a natural brunette who used to dye her hair blonde, until she found out her preferred brand of hair dye was tested on animals; she permanently scarred the firm's owner, Amy Mercedes, and never dyed her hair again.
Blood is shown twice in this episode, which was a rare sight when the episode was made. Enrique El Gancho cuts Batman's arm and has blood running from his nose.
Though he had appeared as Dick Grayson in Sins of the Father (1997), this is the DCAU debut of Nightwing.
The shipping schedule contains the names of several famous ships: Andrea Doria was an Italian admiral; several ships were named after him (most famously an ocean liner that capsized in 1956). The S.S. Minnow is the charter boat that ran aground in Gilligan's Island (1964). The HMS Bounty is famous for its 1789 mutiny. The Poseidon is a cruise liner from disaster book and movie(s) "The Poseidon Adventure".