The Ashigaru (foot-soldiers) all wore Mempo (face masks). Mempo were only worn by samurai (and not even then by ALL samurai), who were all mounted. The reason for this is because pretty much all of the Ashigaru were played by Canadians, and the Mempo hid this fact.
Uesugi Kenshin (Kagetora) is referred to as the "Tiger of Echigo." This is incorrect, as he was known as the Dragon of Echigo, whereas Takeda Shingen was called the Tiger of Kai. This is very odd, considering the director is a Japanese, and so are the rest of the crew.