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When the angel (Tilda Swinton) gives Constantine a lecture, hospital wristbands can be seen on her hands. In the overhead shots, the wristbands on her left hand behave calmly and lie flat. But in the shots where the camera rotates 90 degrees, one of the wristbands keeps sticking out.
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In the scene where a shocked Angela rushes to the window with a view of the sky, no bars are visible on the window. However, when she is shown in a close-up near the windowsill, a diamond-patterned grille is clearly visible.
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The film is based on the 1988 comic book series «Hellblazer». John Constantine first appeared in Alan Moore's comic Swamp Thing.
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According to the original plan of the production team, the filming of the picture was to be entrusted to Tarsem Singh, and Nicolas Cage was to be cast in the lead role. However, the director was against Nicolas's casting from the very beginning and ultimately left the project. After some time, Nicolas Cage followed suit.
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Despite the fact that the film Constantine was based on the plot of the comic book Hellblazer, it was decided to give the film a different title to avoid confusion with another similar title, Hellraiser.
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In the comic book, the main character John Constantine was originally from Liverpool, but in the film he became a native of California. In many ways, this decision was due to the choice of the actor playing the lead role. Keanu Reeves is a typical American, and it is unlikely he could have convincingly played a Brit.
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According to Clive Barker, the prototype for John Constantine was the popular singer Sting.
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Peter Stormare was considered for the role of Balthazar.
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The tattoo on Constantine's hands is the alchemical symbol of the Red King, protecting the one who bears it.
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To get into character, Rachel Weisz visited a morgue.