Revealing mistake: Before the final battle, just after Katsumoto says that the Imperial army will not surrender, there is a cut, appearing when the Japanese army are ready to attack. You can see, at the right side of the screen, a transparent man walking in front of the troops. Actually you can only see a pair of legs walking without any body.
Revealing mistake: During the final battle, some samurai horsemen are lighting hay panels to create a smokescreen. At one point a horseman rides past two of them without touching them with the torch at all, and they still catch fire. Moreoever, they start to burn from the bottom, not where the flame could have touched them (which of course it didn't).
Add timeDavid Mercier
Revealing mistake: During the melee in the final battle, towards the end, Algren looks around, seeing the death around him (much of this is in slow motion). In one of the shots focusing on Algren, behind him, on the left side of the screen, you can see an army soldier using his rifle to fight in close quarters. As he brings his rifle up, it noticeably flexes, indicating that it's a stunt-friendly rubber prop, rather than metal and wood.