Ready Player One: Every Pop Culture Reference In The Trailer

5. Deathstroke And Harley Quinn

Mister J won't be too pleased about this, but Deathstroke and Harley Quinn can be spotted hand in hand early on in the Ready Player One trailer.

Around the 30-second mark, the viewer sees the world through the eyes of protagonist Wade Watts and a pair of figures cross his path, forcing us to do a double take.

One of them is garbed just like Harley Quinn from the Arkham Knight video games, complete with pigtails and frilly skirt, while the other is masked with a pair of crossed swords on his back and what looks like an ammo belt across his chest.

At first glance, the mystery male could be mistaken for Deadpool, but Marvel-DC romances are almost unheard of, so this has so to be Slade Wilson.