Over at Thompson on Hollywood, the ever-astute Anne Thompson has a great analysis of what really happened with Edward Norton's involvement in writing the script for The Incredible Hulk, what ended up on the cutting room floor during post-production, thanks to Marvel's final cut rights, and why the WGA didn't end up granting him script credit. It's an interesting look at the behind-the-scenes details of how these things work in Hollywood. Thompson says, in part:
Norton mostly changed dialogue, filled in gaps of motivation and developed character. For example, the scenes in Brazil about finding a serum in the Amazon to cure him, and Banner's emails with Tim Blake Nelson, were Norton adds. Marvel agreed to shoot Norton's script.