I remember years ago talking about the printing process with a former schoolmate.
His job at the time was proof reading which meant reading every page of every publication the firm printed for correct spelling and punctuation etc..
In fairness, as a younger library user, cannot remember any obvious spelling mistakes in the hundreds of books I have read.
Compare this with the news TV channels and the yellow banners that appear which often, despite modern spellcheck software, contain errors.
Hopefully the writing up will be error free and legally flawless.