There is no such thing as a mistake that is not recoverable. No such thing as a mistake that is a game changer.
There are however, mistakes that make it more work than you think it is worth to recover, or would make it more worth while to change the game. But that is a very different thing.
Steve Layman has not done a book, and I would not hold my breath that it is going to happen. His ego is just not wired in that direction.