Dude, I totally noticed this. I guess I'm always looking for philosophers on Lost since they already have John Locke, Rousseau, and [Desmond] David Hume. There was bound to be another entry of a philosopher sometime. I was pretty impressed they had Charlotte studying at Oxford where C.S. Lewis taught which made the reference all the more obvious. Of course, I wouldn't make too much of it as if the characters are supposed to be direct application of the views of the philosopher. It's just in the tradition of their constant enjoyment of making reference to culture, pop culture, other movies, and so forth.