When Eugene "The Plague" Belford, is on the plane near the end of the film, he uses the pseudonym "Mr. Babbage". This is a tribute to Charles Babbage, the inventor of the first finite state logic machine, a predecessor to the computer. See more...
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Continuity: Near the middle of the film when Joey gets arrested and is being walked down the stairs outside. If you look in the front halfway down the stairs you can see a guy holding a brown box, but when the camera cuts to a face shot of the black man in front of the camera the man holding the box has disappeared, but he should still be visible because he was only half way down the stairs.