Guilty as well! Discworld does this too. It doesn't matter if I've read the last three pages--none of it will mean anything without the context--and by the time I've got that context, I'll have become engrossed in the plot and forgotten whatever I read at the end of the book anyway. It's almost impossible to spoil oneself that way on a Discworld novel, and I love that so much (even while I find it frustrating, lol).