That there is! The duplicate page numbers occur when you are turning over an item that's in the book rather than a page of the book itself. For example, the page 18 & 19 spread has the library bingo card in it. In the first version of that spread, you can see the contents of page 18 but the card is covering the contents of page 19. When you turn the page, you are flipping the bingo card over, so now it's covering the contents of page 18 and you can see the card's back plus the contents of page 19. Page 44 appears duplicated but it's because the corner of page 45/46 has been torn away, so you see "44" again. Does that help?