User blog comment:Elrohir of Valenwood/Living in Skyrim/@comment-4057437-20120525064750

Such "Easter Eggs" are scattered all over Skyrim. We are of the impression that they contain clues to what they are a reference to, but have had little luck in figuring most of them out. Some will have a note or journal, others may be referenced to in the text of an otherwise ordinary book that has copies scattered around Skyrim.

There is a page about them: Easter Eggs(Skyrim)