The only issue I've had with instruction books lately was with my UCS Death Star; about a dozen of the pages were missing. I was able to go online and download the PDF version to complete the model, and after contacting LEGO customer service they sent me a replacement copy. In this case it was a spiral bound book, and when the pages were stacked a section was missed (interesting fact: books are often assembles in sections, or "leaflets", and then sewn, glued or stapled together at the spine).
As with any printing process there are bound to be errors, in this particular post I conclude that the final guillotining process was somehow missed, or this particular book was misaligned on the press. My old next door neighbour is a book binder (a dying art) and he shared many stories over beer with me about this type of thing.