A slightly annoying discovery--I hadn't accounted for the shift in the left-hand page header when the page numbers went from one to two digits (I suppose I'd better make a note to look out for that when the page numbers move to three digits). A lot of stuff had to get reprinted, but I guess it's good I caught it now rather than 100 pages down the line....
Anyway, because of that I only input corrections for three more chapters. Better than nothing, I suppose....