whoa, what a huge checklist of possible mistakes. Fortunately, I've found none of those here. Pretty good piece. Overall,the composition and the arrangement is pretty good, i like the instruments, and the production you've put into it. The piece is a bit far from the original. Doesn't sound exactly like it: in fact, it does sound BETTER, while staying close to the source (in the overall feeling), it has a pretty different arrangement. Somehow this reminds me of Bart Kepka's music (Another OCremixer, I highly encourage you to check his music)
One thing: The sampled-chinese-violin, on 1:54 sounds fake. Try not to put so many notes together!. Remember you're using samplers, not real instruments.
Other than that, bravo. Good work, man.