Things You Didn't Know About DCEU Villains

The Suicide Squad viewers get introduced to King Shark while he's reading the theological text The Varieties of Religious Experience by William James.

King Shark is a demigod in the comics and there's a passing reference to his suspected divine heritage in the film. This uncertainty may be why he's reading the book upside down.

Harley Quinn originated in Batman: The Animated Series, while Mercy Graves (Lex Luthor's assistant/bodyguard) originated in Superman: The Animated Series. 

Both were later incorporated into DC's comic books and eventually the DCEU.

Edgar Winter is a classic rock star who was born with albinism, resulting in snow-white hair that he keeps long.

When Michael Rooker played Savant in The Suicide Squad, director James Gunn supplied Rooker's hairdressers with photos of Winter.

Granny Goodness is a DC supervillain who was created by Jack Kirby in 1971. She made her DCEU debut in Zack Snyder's Justice League, appearing with Darkseid and DeSaad on Apokolips. Additionally, her name appears on a hotdog cart before Barry Allen saves Iris West.

If you pay close attention to Harley's mugshot in Suicide Squad, you will read the date October 13, 2014. This means that Batman caught her on that day.

When Deadshot's weapons list flashes across the screen in Suicide Squad, a potato gun is on it. Other unexpected weapons on the list are a flare gun and an anti-tank rifle.