J I Cohen

Suckers - S4-E13

Factual error: Grissom sees an information card for a 17th century suit of Japanese armour (just the card, not the suit itself), and immediately deduces that the suit must actually be from the 19th century, because the Japanese military was formed in the 1860s. That military was westernised, and did not wear armour. There was nothing on the card that falsely referred to that military as being established earlier, or indicated that the suit belonged to it. There was a reference to the "military class", but that was historically correct, and meant the Samurai.

J I Cohen

Overload - S2-E3

Factual error: When they are explaining why a nail was hammered into the electrocuted workman's boot, it is said that cars are protected from lightning strikes because they are insulated from the ground by their tires. Actually, tires conduct electricity, because they contain carbon (see: http://cartalk.cars.com/Columns/Archive/1994/November/11.html). Cars are actually protected from lightning by the Faraday Cage effect, which is explained on http://www.physics.gla.ac.uk/~kskeldon/PubSci/exhibits/E3/. Not a mistake CSI scientists would make.

J I Cohen