Though the Royal Flush Gang existed since Bruce's time as Batman, this is their debut in the DC Animated Universe.
In another connection to James Bond, Olivia d'Abo's cousin, Maryam d'Abo, played Bond girl Kara Milovy in The Living Daylights (1987).
King's line "We have all the time in the world" is a line that his voice actor said as James Bond in On Her Majesty's Secret Service.