Continuity mistake: When Joker is dancing on the stairs he throws his cigarette. Then when the cops arrive at the top of the stairs we see him blowing smoke from the same cigarette. Then the cigarette is gone again. (01:30:40)

Joker (2019)
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Directed by: Todd Phillips
Starring: Robert De Niro, Joaquin Phoenix, Frances Conroy, Zazie Beetz
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Arthur Fleck: My mother always tells me to smile and put on a happy face. She told me I had a purpose: to bring laughter and joy to the world.
Trivia: Towards the end while Joker is being transported in the police car, the shot of him through the window is similar to one of Heath Ledger's Joker in The Dark Knight.
Question: Spoiler! The scene at the very end, with Arthur locked up talking to the doctor/social worker - is that meant to be later, after he's been captured again, or is it a flashback to when he was hospitalised before, as was referenced earlier in the movie?
Answer: This is later, as the building appears to be Arkham. He's committed there instead of going to jail based on his insanity. It appears he is laughing about the death of Thomas Wayne, we see a flash of that scene again for a reason.
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Suggested correction: They purposely stuck the images in a way that it repeats itself over and over again. It's intentionally made in a way of not flowing straightforward.