There were only a few choices about that movie that I think could have been done better.
The movie removed Piter de Vries personality... which was very vivid in the book. I think that was kind of a missed opportunity. They did also drastically alter the personality of the Baron, but I have no complaints, as he was very well done. His portrayal was actually scarier than the book.
The movie also did not include the scene of Dr. Yueh talking with Lady Jessica about Yueh's wife. This would have made the plot more make more sense. It is my understanding the scene was filmed, but removed. I don't know why.