Ooh! The "literal"-ness of that suddenly makes a whole lot of sense of the "Who made you God?" / "You mean there already was a God to begin with?" exchange. Eiri's power comes from the amalgamation of his personality withthe Deus Est Machina Trope itself!. Very meta.
A meta-example: An article in a 1999/2000 issue of Animerica indicated (roughly) that writer Chiaki J. Konaka's goal was to create a series that wouldn't be received the same way outside of Japan that it was within it. Hindsight now tells us he failed in that regard— most everyone goes "well, what the hell was that all about?!". That's not the Fridge Logic. What is, however, is the fact that he wanted to divide people's opinions about a series revolving around the concept of everyone being, on some subconscious level, connected. Self-defeating, don't you think?
Well, perhaps he succeeded partially. While everyone may still get the concept, there will always be someone who has a different opinion, or interpretation on it. And because of the nature of the show, chances are no one is going to be completely divided up over it and is open to any interpretation as long as it makes sense to them.
Early in the series Lain appears to be the sort of befuddled person who is frequently described in the American vernacular as "isn't all there". After a while it becomes apparent that "isn't all there" is the literal truth — Large parts of her are in the wired.