^very true, indie boy. Some sources state that he was also partly based on the Marvel Comics character, The Watcher. Although in Walter's case years ago he didn't merely observe, he actually did something benevolent.
I rewatched the Pilot and episodes 2 & 3, and yup, The Observer was there all right--it's like
Where's Waldo?, LOL
No new Fringe episode this week due to the Presidential Debates on US TV, so there's enough time for me to search for the easter egg that gives a clue about the next episode--just like
Lost, this show hides a lot of easter eggs, not just within the show, but also in the title sequence: a single frame appears with the words "
Observers Are Here" for one second just after the words "Dark Matter" in the title credits.