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Trivia: The numbers on Carl's wagon are the date when the original Terminator film was released.

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Trivia: On the bridge Sarah says the classic line of the saga "I'll be back."

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

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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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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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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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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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