Factual error: After Carlton Leach and his friends have been tricked by the kids, a huge fight starts, and police arrive to break it up, a Ford Sierra is seen in the background. The fight is set in 1982, but the model shown is from the early 1990's - impossible for 1982.
Factual error: Several mistakes about the clock in Jigsaw's workshop: around 300 years ago the first pendulum clocks were built. They were completely different by size and design than this one, so the claim that it is so old is completely wrong. Real pendulum clocks like the one seen in the movie never have a second hand from center. You can also see by the movement of the second hand that it is a modern, battery operated quartz movement. This also means that the ticking you hear is not created by the clock itself but was added later. (00:38:40)
Factual error: The license plate on the blue Ford Taurus is 674-H2T. Format for New Mexico standard issue yellow plates is 123-ABC (three numbers, the Zia sun, followed by three letters).
Factual error: Both the Arsenal and Chelsea supporters in the street scenes wear scarves and jerseys without any club logo or player name, the most generic possible, a little darker than Chelsea's real colors and with odd stripes for the Arsenal's scarves, and there's a whole crowd of them. Licensing issues or other reasons, it looks really phony. (00:57:00 - 00:58:10)
Factual error: Although B. B. Rush's wears the rank insignia of a Specialist and he is addressed as Specialist by his interrogator, all the documentation shows his rank as Private First Class.
Factual error: The Mustang used to take Sylvia to her parents at the circus when she escapes is a 1967. The scene is set in 1965.