A lot of Joker footage was cut from the film.
Here’s a brief look at what could’ve been.
The aircraft crashes and its unclear in that moment what happens to him (until the ending).

Moviestore/REX/Shutterstock
Harley stood up to him and refused to betray her new friends, Ayer tweeted.
The Squad turned on him and he escaped.
This was meant to highlight Harleys character arc of growth and empowerment.
Id make Joker the main villain and engineer a more grounded story.
I have to take the good and bad and learn from it.
I love making movies and I love DC [Comics].
Im a high school dropout and used to paint houses for a living.
Im lucky to have the job I have.
I have to give the characters the stories and plots they deserve.
So there are plenty of other opportunities to flesh out the mad clown.