When I first saw a few pages of Chas' book a year or two in advance I was horrified by all the mistakes & said so; his reply was "Don't worry kid, I'll sort all that out"...
I also offered to check Linda Gail's book, but these people's egos are too big (at least Joe asked me & others to look through his script prior to publishing, though ironically his was one of the most accurate of all the books).