The Screenwriters Voice has an interesting breakdown of the differences between the Kill Bill script, and what ended up on the screen.

The volume of Kill Bill on the screen is close to the first half of the 200+ page script that has been floating around some circles for quite some time. But it has been tweaked, and for the better. Expanded, in fact, and a more elaborate and energetic film than most reading it could have imagined. The differences may not be huge, they don’t affect the plot, but they are equally significant and interesting. The script was good, but not great. One realizes quickly, however, that the document is but a glimpse into the world in Tarantino’s mind a peak at a project still under construction.