Anachronisms: The music that the live musicians play during the drum duel scene, although beautiful, is not characteristic of classical Chinese music of that era.
Continuity: The amount of blood coming from Mei's mouth in the final scene changes between shots.
Continuity: During the fight in the snow, snow appears and disappears on Jin and Leo as they fight.
Continuity: Towards the end of the "Echo Game", Leo throws the entire bowl of beans into the drums. They fall the floor, but when Leo moves to Mei, they have all disappeared.
Continuity: Before Jin and Mei are trapped by the bamboo spears they are standing among hundreds of short bamboo spears pierced into the ground as a trap. When the soldiers get killed by The Flying Daggers and fall down to the ground, the short bamboo spears are all gone.
Errors in geography: Most of the trees are silver birch which is not native to China, but is from Europe (this movie was made in Ukraine).
Continuity: Early in the final battle between Jin and Leo, it switches between them holding each other's swords away at the sides to their swords being crossed in front of them while they're on the ground.
Revealing mistakes: In the last fight scene the wind is blowing strongly and snow is falling, but the actors outfits are not moving.
Continuity: As Mei is in the bamboo forest, split between the two bamboo trees several bamboo spears are thrown at her. Two pierce and get wedged in the bamboo trees level with her head. As Mei is sliding down the bamboo they are gone.
Continuity: During the battle in the flower field Jin is wounded behind his left thigh. Near the end when he leaves Mei, he is limping on the wrong leg.
Continuity: The amount of snow covering the trees in the background during the finale varies greatly. In the earliest scenes they are snow-covered, but later scenes show them with no snow on them.
Revealing mistakes: When Jin saves Mei from the general's troops in the bamboo grove, he blocks four swords which are swinging toward her simultaneously. One of the blades, however, clearly gets past Jin's sword. Rather than having his attack deflected, this soldier simply stops his swing and lifts his sword away in unison with the others.
Continuity: In the ending scene when Mei tells Jin to leave, the horse he uses to depart upon has white socks on its rear legs then it has solid leg markings. It changes back and forth from markings to none on Mei's horse also.
Continuity: When Leo is released by The House of Flying Daggers to continue his spying, he isn't wearing his hat. Later, when we see him next, just prior to the final battle, the hat re-appears.
Continuity: At one point during a scene between Jin and Mei, we seen Jins face on the left of the screen with a tree in the background on the right and his hair completely straight. The shot then cuts to Mei and then back to Jin where we see him with a tree on his left and his hair being blown by wind.
Continuity: An obvious camera reversal during the ending scene whith Mai and Jin. When Jin is seen, the snow is flying from left to right, the camera changes to Mai and back to Jin and the snow is flying from right to left then again from left to right.
Continuity: When Wind stops on his horse to return to Mei the first time, his horse is a light brown when he stops, but throughout the scene, it changes to a dark brown.
Continuity: When Mei is feeling Jins face and body in the woods, you can clearly see Jin has an arrow sling on his back with 5 arrows. When Jin is saving Mei from the troops by firing arrows, He has more than 5 arrows in his sling.