Justice League: 29 Easter Eggs & References You Need To See
25. Black Mask
During the film's opening sequence in which Batman subdues a criminal and uses him as bait to lure out a Parademon, a sign reading "Janus" can be read just as the Caped Crusader and the monster are busy flying through the air.
This is a clear reference to Janus Cosmetics, the company eventually owned by one Roman Sionis, better known as his supervillain moniker Black Mask.
While it's not terribly likely the DCEU will be dealing with Black Mask anytime soon, it's nevertheless a cool reference for fans, to know that he absolutely, positively exists within this universe.
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