Two Birds of a Feather - S3-E19
Factual error: In his 'Nam flashback at the beginning, Magnum has (another) fun encounter with a large macaw. Green macaws (or any macaw for that matter) are not something he would have found in a Vietnam war mission, unless he inadvertently crossed the Pacific Ocean and ended up in South America. (00:02:00)
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.