When Kagemusha is being ejected from the Takeda clan compound, he is seen with his left arm in a dark purple-colored cloth sling, which covers most of his hand and forearm. As the camera shot changes to a slightly longer shot, the sling is suddenly much narrower, exposing much more of his hand and forearm.
In the final battle there are at least 100 riflemen shown firing their matchlock rifles in volleys. The smoke generated by the matchlocks almost immediately dissipates. This indicates a more modern gunpowder was used in the matchlocks as the historically correct black powder load would blanket the battlefield with thick smoke after a handful of volleys.