The Thirteenth Floor

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• The science fiction novel Simulacron-3 was also published under the title Counterfeit World, it was first published in 1964 by Daniel F. Galouye in the United States, and is one of the first literary descriptions of virtual reality.
• Movie Goof (continuity error): The length of "Tom Jones"'s cigarette in the lobby.
• Movie Goof (incorrectly regarded as a mistake): In the 1937 world, the old man (Fuller) refers to World War I. There had been no World War II yet, thus World War I should have been referred to as "The Great War", but since the world was actually a simulation, this is just an error in the simulation. Many other anachronisms in the 1937 world can be similarly explained, such as the too-new money and a too-new police car.
• Movie Goof (incorrectly regarded as a mistake): When Douglas is in the 1930 reality and in the pool of the hotel he grabs the revolver and he can be seen to check if it is cocked, which it already is. Then he places the barrel in the bartenders mouth and threatens to shoot him. It's believed that when the bartender pushes the barrel of the revolver out of his mouth and Douglas pushes it back in that he is re-cocking the already-cocked gun. However, if you watch after the bartender pushes the gun from his mouth, Douglas moves the hammer of the gun back into place (because he believes he's going to get his answer from the bartender). This makes re-cocking the gun necessary when the bartender doesn't answer after all.