Set to be the final movie in the DCAMU (DC Animated Movie Universe).
Hynden Walch, who usually voices the character 'Starfire' in Teen Titans, voices Harley Quinn in this movie.
The Mobius Chair that Batman sits on in the film has god-level intelligence from its inception from another New God. In the comics, Batman only asks it two questions: who killed his parents (it answered Joe Chill) and who is the Joker (the Chair replied without a name but saying there's actually 3 Jokers).
Rebecca Romijn (Lois Lane) and Jerry O'Connell (Superman/Clark Kent) are a married couple in real life since 2007.
The sixteenth installment in the DC Animated Movie Universe.