Actually, in my experience with ebook publishing, most of the formatting is done by the resellers not the publishers--so you'll see differences between Fictionwise and Amazon, for example, on the same books. That can affect the appearance of the books, spacing between paragraphs, etc. As for typos and editing, that's on the publisher's head, as others have said.
When my own novel Sunborn came out, not long ago, as an official Tor ebook, I downloaded some samples to do a quality check and noticed that a typo from the hardcover had carried over, even though I'd gotten it corrected for the paperback.
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