The mysterious new leader of the flying daggers never actually appears because that role was intended for actress/ singer Anita Mui, who resigned the (impending) filming due to ill health two weeks before dying of cancer. Out of respect Zhang Yimou didn't replace her with another actress and the film is dedicated to her memory. See more...
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Continuity: In the bamboo forest fight scene, Jin and Mei are pinned down by the bamboo spears and they are surrounded by a field of bamboo stakes. But when all the soldiers that were sitting in the bamboo are shot down by the Flying Dagger members, the stakes suddenly all disappear, and then reappear after all the soldiers have landed.
Continuity: During the fight in the bamboo forest the soldiers throw many bamboo spears each, but they are never seen carrying more than one at a time. As they show in the movie, it takes a while to make these spears (cut down a stick, trim off the branches and sharpen it), so where did the extra spears come from?