The theory of Tetrodotoxin causing a period of "zombieism" was written by ethnobotanist Wade Davis in 1983, and in his 1985 book The Serpent and the Rainbow. However, the theory was debunked by the scientific community later in the 1980s, claiming the symptoms of voodoo zombies did not match the ones created by the poison, and no substantiation of zombies created this way existed.
The term 'bocour' is French and has no relation to voodoo; in fact, it describes the class of people who used to carry out the executions of criminals in France. Edited to add: However a Bokor is a true Vodou term who can either be the leader of certain sects of the religion or a witch for hire who serves the Loa through both good or evil means.
Tubbs is shown reloading his 5-shot revolver during the climactic gunfight - arguably the only time in the entire series that he does so.
Although Crockett and Tubbs scoff, the concept of the zombie is actually a traditional part of Haitian folklore, predating the (distinctly different) popular conception of a reanimated, flesh-eating corpse as made famous by Night of the Living Dead (1968) and its sequels.
Baron Samedi is named for the actual voodoo god of the same name, and is also shared with a James Bond villain in Live and Let Die (1973).