Why do some books have page numbers that differ from all official sources?

[Karin]

For example, if the publisher, Library of Congress entry and Amazon all give a certain number of pages for an edition, why have pages been added? Aren't unpaginated excerpts from other books advertisement?

[Hannah]

What book do you mean?

Sometimes the page numbers don't come through in the imports. Other times, page numbers are added as an estimate; 400 seems to be a common number attached to prerelease titles. These are updated manually after the fact. In this case, some one may simply have transposed the numbers or hit a wrong key.

[Renske]

We don't count previews of other books, we even adjust the number if a preview is included in the number of pages. But sometimes things we do count are on unnumbered pages, then our number can be higher than other sources have. Here is the information in the librarian manual: https://www.goodreads.com/help/show/2...