While it is a relatively minor error, it did give me (and I'm sure many other newbies grief). The filename listed in the portage install portion of the document lists the /snapshots directory when its really the /snapshot directory. (At least on my cd it is.)
It's been fixed and made consistent across all arches in the recent media refresh (2005.1-r1) http://www.gentoo.org/news/20051121-release-2005.1-r1.xml