Fringe Thinking

Last night's episode was fantastic! Lots of good things to observe.
We got confirmation that Peter is from the other side from the hippie chick (although that was pretty much already confirmed). This raises the interesting question: Olivia is able to move between universes without being ripped apart. How did Walter and young Peter do it? Was alt-Peter treated with cortexiphan?
We learned that sometimes, you just need a shot of mercury to feel better, especially if you're a shape shifter who's been in his body too long.
Nina Sharp produced two snow globes out of thin air - really, they did NOT match the decor of her office and there's no storage in there... Still, nice illustration.
Walter finally caught on that the shape shifter was still around. But here's my nit-pick. Olivia was staring at the partially rendered head of the shape shifter when the bell brought back her memories. But she looked like she was starting to recognize that head as Charlie's. At any rate, it was clearly not Nina Sharp's face forming there. Yet, in Nina's office, she was willing to believe Charlie's word on who the shape shifter was. I'm guessing this is because Olivia was willfully ignoring the possibility that her stalwart ally Charlie was really dead.