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Preparations for the film began in 2007, but at that time it was a strike by Hollywood screenwriters, and the screenwriter Aziva Gosman also participated in the strike. As a result, the half-written script had to be stopped halfway, and the film's start time was therefore put off.
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The St. Peter’s Square that appears in the film is a scene completely constructed by the crew, because the Vatican Church does not allow the film crew to enter the real St. Peter’s Square to shoot the film.
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Although the novel of "Angels and Demons" was written before "The Da Vinci Code", the filming plan was set after the completion of the film version of "The Da Vinci Code". Nominally "Angels and Demons" is a sequel to "The Da Vinci Code". Actually, judging from the content of the story, it is more appropriate to call it a "prequel".
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Naomi Watts originally planned to play Vittoria in the film.
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Alfred Molina, who played the role of villain in "The Da Vinci Code", only appeared in the trailer in this episode with voice, and did not make a head-on appearance.
Angels & Demons behind the scenes gags
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Robert Langdon: [Swiss Guards Offices corridor. As Langdon and Olivetti walk, Langdon studies the row of statues of Male nudes that line both sides of the hallway, all wearing fig leaves] The Great Castration.
Inspector Olivetti: I beg your pardon?
Robert Langdon: 1857. Pius IX felt that the male form might inspire lust, so he took a hammer and chisel and unmanned hundreds of these statues. These plaster fig leaves were added later.
Robert Langdon: [Olivetti stops abruptly outside a heavy steel door with a security keyboard beside it] Are you anti-Catholic, Professor Langdon?
Robert Langdon: Me? No, I'm anti-vandalism?
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Assassin: Be careful. These are men of God.