Looked at it for 10 seconds and immediately found random 0s at the end of the document or unreplaced text like “Noel Llopis in his September 2009 article[#!NoelDOD!#]”
The intro describes that it's a free version of a book that contains most of the content except for a few sections.
The book was converted using an automated format from it's native design into html so a large portion could be made available for free and this automated conversion process might have some minor issues -- like the one you described.
