I can't present proof because I did not bought the book then and the copy I have today no longer has any typos, indication of someone going through the work again and reviewing it but the worst proof-read book I ever encountered was a portuguese translation of Michael Crichton Canibals. It was so bad it felt the book, back in the early 00's had been put through a machine auto-translator and just sent direct to print.
Missing letters in words, random capitalization of words mid-sentence, ortographic errors, repeated sentences, broken paragraphs, mixed paragraphs, etc.
I should have bought and kept that book. I wish I could find a copy of that specific edition. It wasn't poorly proof-read and edited. It was cursed.