Well, i have the Pins and Needles edition of the Dark fall games and in the walkthrough / companion booklet that comes with it it mentions the following as Easter eggs:
Room 2C: Green Room, with abstract art.
EASTER EGG: This room changes, with each visit. Sometimes you will see the ‘Dark Fall’ symbol on the wall, other times you will find a battered looking trilby on the bedside table.
Room 2D: Polly and Nigel's room.
EASTER EGG: When looking at 20th Century Mysteries (on the computer), notice a fourth link has appeared on the ‘Recent’ list. Click it, to use The Seeker website. “Cross my site with webhits and learn thy past, Mortals!”. It’s daft, but it is fun. Polly had an eclectic taste in websites.
No mention is made of any other 'Easter eggs'but there is a complete listing of all of the use points for the ghost hunting goggles and all of the possible questions you can ask the various ghosts and the ouija board.
There are no Easter eggs mentioned for Lights Out.
I really reccomend the companions for both games (the Journal and Lights Out). They can both be purchased on their own (ie you don't have to buy a copy of the game) from the darkling Room website. And no, i am not Jonathan Boakes! If i was i wouldn't keep spoiling the new game by releasing too many screenshots and too much advance information! He he. My fault for looking... but i just couldn't resist.