Factual error: When Blackthorne is on Rodrigues' ship, Rodrigues offers him grog. But grog was only invented in 1740, by British Vice Admiral Edward Vernon, whose nickname was "Old Grog" because of his preference for coats made of grogram cloth.
Factual error: It is stated in the episode twice that Rod 'did time' in Camarillo, but Camarillo does not have a penitentiary, just a jail and (had at the time) a State mental hospital, neither compatible with his 18 months sentence for growing weed. (00:25:00)