[relictele]

We didn’t follow anything from the comic books, which people are gonna be mad about,” writer-director Todd Phillips told Empire. “We just wrote our own version of where a guy like Joker might come from. That’s what was interesting to me. We’re not even doing Joker, but the story of becoming Joker. It’s about this man

Right. Who goes to a comic book film about a comic book character and says 'I hope there's nothing from the comics in this!'?

What 'writer-director' Todd Phillips is admitting is that making derivative material is OK as long as you have the fig leaf of existing characters - even if you ignore the existing character's story. It's lazy and mendacious in equal parts.

[a fool in paradise]

The only thing Who Framed Roger Rabbit kept from the book were a few character names and a stupid joke about a 3-year old dinky.

Plot spoiler - Roger did it.