sodapop In this case you were mistaken, but you are absolutely right that proof-reading has become very poorly done or is even non-existent these days. There is far too much reliance on the automatic spell check.
More than 40 years working in publishing means that I have a very sharp eye for literals and other inaccuracies. Dan Brown had no idea where the American Embassy is in Paris; Lee Child didn't know about British pub opening hours back in the day and in some detective story I read recently the body was lying prone with its eyes staring at the ceiling – obviously Death of a Contortionist.
Even if the author gets it wrong, there should automatically be checks by the editor, copy editor and proof-reader. Things can still slip through because nobody knows everything, but too much slips through these days.
I have no idea whether the story is true, but it is said that many years ago OUP fined its editors and proof-readers for any mistakes that appeared in the final printed version. I would guess that such a regime was brutal but effective – and wouldn't happen these days.
Just for the record, I am still embarrassed by a few real horrors I let through when I was green and and in my salad days all those years ago.
Adult early 30's - very difficult.
Last weekend, in Rutland, the first statue in Britain of the late Elizabeth II was unveiled.