So if you think once you get an agent and a contract it's all fun and games, you are wrong. So wrong.
(1) Today I got yet another review pointing out the various historical mistakes that (a) were supposed to be cleared up by copy-editing, but the corrections we agreed on were never implemented into the final manuscript file by the editor, and/or (b) were historical inaccuracies that were not part of the book and were slapped onto the back cover and all the promotional material by an overworked assistant who hadn't read the book. Every single review has hit on at least one of these mistakes, neither of which were my fault. Of course I don't respond to reviews, because as an author you don't do that, but I have addressed the issue on my website and in interviews, which of course means nothing to the person who is a discerning historian and just picked the book up in a store. Eighth month after publication and I still want to hit myself in the face whenever I see a review mentioning them and therefore downgrading my book.
(2) The cover for another book of mine went unapproved to Amazon for the pre-order. Now technically I have no control over the cover, but it is a confusing cover that makes no sense and is downright misleading, and I will have to stamp my feet and be really annoying to the already overworked production department to get them to change it, and even once they do Amazon will not bring the changes up until months after it's published. If I can get it changed at all.
(3) Amazon.co.uk has a funny additude of putting a book into pre-order again instead of admitting that they are out of stock, claiming the book hasn't been published yet and will not be published until whatever the next shipment date is, even if they've been selling it for six months. This wouldn't be so annoying if it didn't automatically delete pre-existing reviews (most of my reviews are positive so I don't want them deleted, or the negative ones either so people know what they're getting), because the website thinks this is a whole new book. I wrote Amazon.uk about this, to which their response is, "Send us proof of the original publication date," as if they can't check their records to show they've been shipping the same book for 6 months, they're just out of copies. So I send them a screenshot of the Amazon.com page with the ISBN and publication date, and they don't do anything about it anyway.
(4) Amazon does not believe I'm the author when I say, "Hi, I'm the author and you're incorrect about the description of the book; you should fix this." Even if my publishing company insists that I am, in fact, the author.
This isn't really anybody's fault in terms of being mean or evil, but more a combination of people who are overworked, people asked to do a job they aren't given proper information about, or companies with better things to do with their time. The manuscript passes through a bunch of hands before it makes it to yours, and any one of those could make a change and either not tell me or tell me well after it's possible to fix it. So next time you're reviewing a book, consider that a seemingly minor mistake it might not be the author's fault.
If Philip Dick was alive I would feel really bad for him, as the current edition of his books has summaries on the back that either give away the ending or are just plain wrong about anything that occurs in the book. And Philip Dick books often have twists at the end, so this is a really big problem for the reader.