Other mistake: During the first fight scene on the bridge, you can easily tell the difference between Yun-Fat Chow and the stuntman who does his stunts. The stuntman has a small balding spot on the back of his head and Yun-Fat does not. You can see this throughout the scene whenever the camera angles change from a closeup to a wide view. (00:02:10)
Other mistake: In the scene where the monks are tied up, Chow Yung Fat is thrown into a brick wall. There is a shot of bricks falling off the wall, but if you look closely, you can tell they are brick tiles, made to look like bricks. (01:25:19)