Revealing mistake: The subway station is identified by its internal signs as "Central" station, but as the Suicide Squad enters its exterior entrance, the sign above declares that it is "Bay St." station. Bay Street Station in Toronto is frequently used for movie shoots, as it has a complete lower platform which has been out of service for decades (https://en.wikipedia.org/wiki/Bay_ (TTC) #Lower_Bay).

Suicide Squad (2016)
1 video
Directed by: David Ayer
Starring: Will Smith, Margot Robbie, Scott Eastwood, Cara Delevingne
Continuity mistake: While the Squad is patrolling the city, the ends of Harley's bunches keep changing in style; they are straight when she's changing at the prison and on the helicopter with the Squad, really curled after Rick kills someone, then jump between straight and slightly curled for the rest of the film, with the exception of the end scene where she hasn't got her hair in bunches anymore, but a different hairstyle.
The Joker: What do we have here?
Harley Quinn: What you gonna do? You gonna kill me, Mr. J?
The Joker: What? Oh, I'm not gonna kill you. I'm just gonna hurt you. Really, really bad.
Harley Quinn: You think so? Well, I can take it.
Trivia: Stay after the credits for another scene with Viola Davis.
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Answer: Because he's already been into the liquid, it's how he became the Joker. He wanted Harley to be just like him.