Walter, back in his lab, flicks on his magic window to watch Walternate toil away (and also drink -- Walter, not Walternate).
And then Walter notices something, and he stands up. "The compounds you're using for the cure ... not random at all. You are very, very smart." Just then, Walternate seems to be distracted by something just off screen, so Walter swivels the screen, and we can see Walternate talking to The Observer, while also gesturing at his experiment. Then the experiment goes blue, and Walter goes all giddy, at least until he realizes that Walternate has his back turned on the experiment, talking to the strange bald dude, and doesn't turn back until after the solution has gone back to its milky colour. Walternate never saw it blue, and he shakes his head, while Walter futilely pleads with him: "No! You had it, the cure! All you have to do is stabilize the compound, and you can save him. You can save him!" In anger, Walter throws his glass at the window, spiderwebbing the glass and knocking it over, which is going to be awfully tough to explain to the warranty people.
And then it's back to the past, as a zeppelin hovers over 1985 alterna-New York, while two Observers stroll out of a showing of the blockbuster movie Back to the Future. Amusingly, they seem to be carrying Slurpees -- possibly Tabasco-flavoured. Of course, this is the universe where Eric Stoltz was allowed to finish filming and went on to another successful sitcom in Spin City, while Michael J. Fox eventually had a memorable turn in Pulp Fiction as a drug dealer. Neither of the two Observers -- who are dismissing humans' cute ideas regarding time travel as mere "entertainment -- is the one we always see pop up, but that one does show up to tell them that he's made a big mistake. Are they speaking even more slowly than normal?