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Trivia: The song "Guitars Cadillacs" from Dwight Yoakam can be heard when the Rev 9 is falling from the sky, that song was used in T2.

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Trivia: Diana has on her hotel bed some comics of Batman and Superman.

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Plot hole: Lewis fixes the timeline by saying to the hat machine "I'll never invent you", then takes Goob to the future. That present is still dark but it shouldn't be like that.

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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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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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