At one point in the movie they show a shot of London from the sky. They edited it pretty well to add Tudor-style buildings and the such, but in the background on the right side of the screen you can see the London Eye Ferris Wheel-which wasn't even completed until 2000.
Actually, this isn't a slip-up at all. In his DVD commentary, director Brian Helgeland declared that the ferris wheel was added intentionally, and that the bird's eye view of London was made with an old-fashioned scale model, not with computer graphics.
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