Were any corrections ever posted? I realize that this thread is four years old, but this still seems the best book for beginners (especially kids) to learn modding.
My son was never able to get the Chapter 11 code working -- and I spent a couple of hours and it seems identical to what is in the book. But Minecraft crashes, when trying to place the plant block.
I found a download of the book examples, but they aren't compatible with the code in the book -- they seem to use different imported libraries.