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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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Other mistake: In London while the sand storm happens the cars are flying around because the wind, but Nick and the blonde girl are unaffected.

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Trivia: The giant face in the sandstorm resembles the one seen in Brendan Frasier's 1999 film.

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Continuity mistake: After the truck hits the car with the cocaine inside it, the truck gets dust all over it which disappears moments later.

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Continuity mistake: After Cooper notices that Hauser is corrupted she touches her fists with him, the level of the window changes between shots.

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Trivia: In the novel the main character is named Victor not Henry - his helper in this movie has that name, a reference to the book maybe.

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Continuity mistake: While Dr. Waldman is about to examine the monster he has his eyes open but in the next shot they're closed.

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Continuity mistake: At Live aid while Radio Ga Ga is starting there is a guy in shorts and a red shirt behind Freddie who disappears and reappears between shots.

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Continuity mistake: When the monster is about to interact with little Maria the sun changes between shots.

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Continuity mistake: When the father of Maria speaks with the police chief the sun changes between shots.

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Trivia: In the show Tiffani Thiessen was the love interest of Mark Paul Gosselaar as Zach - he actually had a relationship with Lark Voorhies.

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Trivia: The fortress of solitude is a replica from Richard Donner's Superman film.

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Trivia: Ramsés is played by Silver King, a Mexican professional wrestler.

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Continuity mistake: The black and white paint on Borra's face disappears after the last fight.

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