Factual error: In the scene where you see the United States Flag, it is the wrong flag. It has 43 stars, something the flag did not have until 1891.

Revealing: The road leading out of the samurai village has distinct tire tracks from vehicles.

Revealing: When all the "ninjas" are attacking the village after the big entertainment show, you see Algren sticking his sword through a ninja, so the end of it comes out on the other side of the ninja's bag. Then you see Algren drawing the sword back again, but the part on the other side doesn't move an inch.

Continuity: In the scene where Hiroyuki Sanada, who plays Ujio, is riding his horse and charging the howitzers, he gets shot by the gatling gun and falls down dead. In the next scene he can be seen in the upper left corner still riding, wearing his distinctive gold circle armor.

Revealing: 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.

Continuity: In the scene where Algren is trying to prove to the Colonel that the soldiers are not ready to fight by having the man try to shoot him, the first barrel band on the soldier's musket (the one closest to the muzzle) is detached and dangling just behind the front sight. It stays in this position for several shots and then magically resets itself after the weapon is fired.