At the very least they could use editing software with a spellchecker! I know there are OCR checkers that search for common OCR errors. OCR errors get even worse with books that use a lot of special characters and letters with umlauts and diacritical marks. OCR also has a tougher time with serif text, and most printed books seem to be in serif. I get tired of reading 'I' instead of T, as well as all the other common errors.

I'm currently reading a history of the European theater during WWII. I am annoyed by the dozen or more ways that Fürher has been spelled due to the OCR getting totally confused over umlauted ü. Add to that all the German, French, Dutch, etc. words that use umlauted letters and parts of the book are really annoying to read.