Many version of the script have been done, adding, modifiying or changing the firsts choices or characters we initially made.
Here's an animatic (animation) (Video + sounds) done in june 99, and a second of the movie, done 6 month later.
The differences between the video and the final cut are huge. It's funny to see how far from the original story we can go, and how from a first plot, we can imagine all kind of new directions.