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Trivia: Arthur takes Sophie to a place for dinner on the street Jerome, a small reference to Jerome Valeska, a character who becomes the Joker in the Gotham TV show.

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Trivia: The social worker who talks with Arthur has the last name Kane as a reference to Bob Kane creator of Batman and the Joker.

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Trivia: The news says something about giant rats around the city. While Arthur is talking with his boss on the phone on the street around the corner a big rat passes by (00:28:55). The rats appear also by the garbage bin when Arthur walks past the dead Wall Street guy (00:34:05) and when Bruce is crying over his dead parents (1:53:30).

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Trivia: Deborah Kane, the social worker that helps Arthur, is the same character that took a role in Batman The Ultimate Evil.

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Trivia: Arthur makes a smile with his hands around his mouth as a reference to the film The Man Who Laughs.

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Trivia: The license plate on the police car that takes the Joker to jail is 9189, a small reference to 1989's Batman film.

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Trivia: The doctor that helps Penny at Arkham was Benjamin Stoner - in the comics he was the enemy of Doctor Fate as Anti Fate.

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Trivia: The friend of Arthur, Gary, resembles Gaggy, a character that helps the Joker in the Batman #186 comic book.

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Continuity mistake: When Arthur imagines that he is on Franklin's TV show the button on Murray's jacket is off then on. (00:12:20)

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Continuity mistake: Just before Arthur is hit with the yellow sign there is a person behind him that disappears between shots. (00:02:45)

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Continuity mistake: After Arthur steals the file from the guy in Arkham he runs and the file moves from one arm to the other. (01:13:10)

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Trivia: The guy in the Waynes' mansion that helps Bruce isn't named onscreen, but is credited as Alfred Pennyworth, the butler of the family and future helper of Bruce as Batman.

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Trivia: The sequence of the Joker killing a person on TV was also seen in Frank Miller's graphic novel The Dark Knight Returns.

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Trivia: While Arthur is getting made up to go on the TV show, with the mirror and the lamps you can see Batman's face.

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Revealing mistake: The sign with "everything must go" breaks a second before it hits Arthur. (00:02:55)

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Trivia: The final makeup of the Joker was inspired by the serial killer John Wayne Gacy, who went by the name Pogo the Clown. The club Arthur performs at is called Pogo's too.

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Trivia: Brett Cullen (Thomas Wayne) played a small role in The Dark Knight Rises.

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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.

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Trivia: Arkham Asylum is seen, albeit not named exactly that.

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