The best thing to do really is to just read the comments in the pages (Heather posts a new topic for for comments on each page), and eventually some one will go DRAGHGLREYHTAEIOJDFKJAHGF PEEEEEEENNNNNN!!!!!!!1111one
Also try and keep in mind that since he's sort of an Easter egg, he's going to be hidden on purpose. Think outside the box, basically--is he in a photo on a wall? Is his disembodied head an earring (oh my fucking god heather please make this happen)? Is he drowning in a glass of water? I know as Heathers' getting better and better at making interesting backgrounds it will probably get harder to spot him, but just keep at it.