Errors in published book has been discussed at listservs for a few years now. The Price of Typos in The New York Times explains why copy editing ain't what it used to be.
I would like to suggest that librarians shelving Advanced Readers' Copies helps promote acceptance of typos and incomplete copy editing. Errors are supposed to exist in Advanced Readers' Copies. They're bound early galleys sent out prior to publicaton for review and inspection by groups making purchasing decision. When librarians add them to their collections because they got them for free at some conference (as I know happens), they are intentionally treating incomplete books as the real thing.
It's only a small point in a larger issue, but it does create a tolerance for error among readers.