Noah
This was a great movie, but it is simply inexcusable for a character to disappear without explanation.
I rewatched parts of the movie twice to try to figure out what happened to Noah. At one point, I concluded that the guy who protested the wages at the first camp (the guy who fought with the cop before Tom and Casy hit the same cop) was Noah, even though he didn't look like him.
Then, I read on this board that he simply disappeared.
Simply inexcusable.