There is an Easter egg in Ghost Dogs of Moon Lake, which you can acquire by dialing 555-SOLV on the phone (555-7658). It sounds like this was part of a pre-game contest of some sort. There are three new areas in the woods that can be accessed if you're holding the egg in your hand at the time, but there's nothing of interest in them... they just look like any other forest square, except that one replays the video of the shed exploding and the other two have text messages related to people from the Nancy Drew message board.