Audio problem: Every time a sword is drawn, be it fast or slow, there is the 'shiiink' sound that is made when a steel sword is drawn from a steel scabbard (a sound that a western sword would make), yet Japanese swords have a wooden scabbard so the draw should be silent.
Audio problem: In the scene where Algren is talking to Katsumoto about General Custer, there is a shot from behind Katsumoto's head and it is clear that he is talking and yet his mouth isn't moving.
Audio problem: When Algren fights the five "ronin," he does not shout out when he kicks at one of his opponents; yet in a flashback a few moments later, it is obvious that a war cry was added in.
Chosen answer: I'm not 100% sure, but I think it may have been Jim Cummings. He does a lot of voiceovers for movie trailers, cartoon characters, songs and the like. He's the voice of Cat in CatDog, Winnie the Pooh, Tasmanian Devil and has had small roles in films like Shrek, Sinbad and Antz. Find out more about him at this address: http://us.imdb.com/name/nm0191906/.