There used to be a quite extensive article about easter eggs in Myth II at http://www.myther.com, but I can't find it any more. Does anyone know what became of it?
The only thing I remember from it is that it pointed out that in the third pre-game picture for The Baron, one of the books in the upper right corner may be "JAWS". I'm not going to make any picture of it myself as it's already on the Journal page for that level. (The link from the Field Guide is wrong, though.)
There are also a few paintings scattered around the level, but I don't know if there's any significance to them.
(Of course, if you want to get into conspiracy theories, there's also the strange fact that the throne rooms have two thrones each, not one. So what became of the evil baroness Kildaer? ;-)
Torbjörn Andersson