Interesting Easter Eggs

I was checking my feedjit traffic and decided to follow some of the searches on google.com on of them got me the following result.

http://www.gryffindorgazette.com/2007/03/14/easter-eggs-in-the-harry-potter-books/

It is a list of some interesting Easter Eggs in the Harry Potter books. One of them I disagree with because it says Hermione's Patronus is a weasel but it was actually an otter.