Creator Leonard Freeman took the name "Wo Fat" from a restaurant in downtown Honolulu. See more...
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Deliberate "mistake": Throughout series: Five-O was said to be Hawaii's state police force, and was shown headquartered in the Iolani Palace. For decades, tourists were disappointed to learn that in reality, Hawaii had no state police, and that the palace was a state museum, not a state police station.
Factual error: Two deaths by bubonic plague, spread by casual human contact, have Five-O scrambling to prevent an epidemic on Oahu. But the disease isn't spread this way (its vector is fleas on infected rats). And since the introduction of antibiotics in the 1940s, bubonic plague has been imminently curable, so there was no need for panic, other than, of course, to make the episode more dramatic.