I was always told you couldn't put liquid paper (ozzie tipex) in your logbook because it is a stat dec, so mine is full of little crossing out's with little signatures next to them.
My logbook also has loads of pages at the front for things like ratings and endorsements, at the top of each page it has a space for my name and ARN. So when I got my SPL I filled in every page with my name and ARN, only problem was it wasn't my ARN, but the persons who issued the licence. So I had to go through a cross them out, so right from the beginning I've has a messy logbook.