"You've no idea how much email I get telling me how wrong every single thing in the book is. There are a lot of very specific things that Americans don't say and English people don't realise … Also New York has enough writers, and I don't think I need to add to them," she said.
Zadie Smith says she will never write another book set in the US, because she got so many complaints about On Beauty. Well, I can see it would be annoying if peevish emails kept turning up in one's inbox. We can only hope Lee Child does not follow her example.
Sometimes, of course, one is bad. One knows one is in the wrong and goes on regardless. Someone pointed out to me some time ago that "in no very good mood" is not American usage. I kept trying to think of a replacement that I liked and couldn't. Finally I thought, Well, it may not be American usage now, but who's to say? Maybe Americans will see it and like it and start using it, and then this instance in my book will simply be the first attested case in American English.