While Batman and Wonder Woman are observing the people coming out of the nightclub, one of Bruce's previous girlfriends (who threw her drink over him in Batman: Mask of the Phantasm at Wayne's party) can be seen getting into a taxi. The Iceberg Lounge featured in the Batman: The Brave and the Bold episode The Mask of Matches Malone!. When Batman loses his memory and thinks he is Matches Malone he goes on an unstoppable crime spree and sent villains fleeing, he briefly occupied the Iceberg Lounge.