The sudden appearance of the X-Men seemed pulled out of nowhere. I've forgotten why a dip like Peter can make such bizarre demands as setting up Professor Xavier's school and have them fulfilled. But if they were getting such amazing results with the second string, why weren't they training Olivia? Olivia was supposed to be the strong one, since she fiddled the idiot box of lights.
We are informed that Walternate's superweapon will destroy the world and Peter. The show doesn't seem to be quite certain which is more important, particularly the X-Men, who seem to think working through their feelings for Walter is more important than either the end of the world or Peter.
The Observers are doing so much acting their name doesn't seem quite appropriate any more. Walter's sudden memory that an Observer told him not to let Peter return is a pretty crude retcon I think. Arbitrarily gifting Walter with lucid moments where he suddenly remembers key plot points has always been a huge weakness in the only good character on the show.
Killing off the X-Men so there can be fake jeopardy about how Olivia, Walter and Peter will return seems more like a stall.
Peter sleeping three days is astounding. I would react far more vehemently at being sedated for no obvious reason. Walternate not bothering to be there is quite peculiar. Walter's easy way of dealing with Peter's voluntary departure was remarkable. Walternate's reliance upon persuasion was equally unlikely, since his plans to save his universe hinged upon Peter. Certainly Our Heroes haven't wasted a second thinking about what Peter himself actually wants.
The fun with the altversions was infectious and raised the episode above average, despite the painful nonsense justifying the plot. Increasing psychic energy!
The weirdest thing of all, in one sense, is a security camera in the hotel filming Peter's departure. Why would they need to go out into the hall. Most of all, since when do security cameras have sound?