There are a few easter eggs in Alan Wake. Below are instructions for how to find some of them:
Microsoft Tag: In Episode four, on the top floor of the lodge is a 'Microsoft Tag'. It looks like an art painting, but you can take a picture of it with a compatible camera phone to read it.
Xbox 360: Also on Episode four, having been asked to return to your room by the doctor, look in the room opposite your one. You will find an Xbox 360 inside.
Added by: MongooseGeneral Aug 17th 2011, ID#7647