Why screw up the last 20 minutes

blog.myspace.com/trolinder: "The Da Vinci Code...why screw up the last 20 minutes and why not keep the first cryptex scenerio in the movie. The movie tried to cover too much ground in 2 hours and 15 minutes. It seemed like everyone involved had no ambition to make te movie good as well. Even Ron Howard considered it a rush job."