I'm reading a book now whose editing irritates me. For quotations, they use the single quote mark ' (what I would call an apostrophe) instead of the double quote mark " which is okay, I think that's a style/regional thing. Except, the quote marks are randomly missing, or randomly inserted into the wrong places. And then sometimes they put quotes from two different characters in the same paragraph.
'Where is the dog? he asked her suspiciously. 'I don't know, I haven't seen him in a while.' But he must be around here somewhere,' she added hopefully.
Also, the single quote mark is such a tiny thing with this font, sometimes I wonder if the random additions are really just accidental specks on the page. The book was new, though.