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.
Suicide Squad (2016)
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Directed by: David Ayer
Starring: Will Smith, Margot Robbie, Scott Eastwood, Cara Delevingne
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More mistakes in Suicide Squad
The Joker: Would you die for me?
Harley Quinn: Yes.
The Joker: No, no, no. That's too easy... Would you live for me?
Trivia: Stay after the credits for another scene with Viola Davis.
Answer: Because he's already been into the liquid, it's how he became the Joker. He wanted Harley to be just like him.