Over There (Part 2)

In this episode, Walter and Olivia continue their quest to retrieve Peter while Bell intercedes and helps them with their mission. In an action-packed climax, Olivia is kidnapped and Fauxlivia takes her place for the return trip home, leaving Olivia stranded in the alternate universe.

Synopsis provided by the Fandom Wiki, Fringepedia, and Wikipedia.

• Timestamp: 01:33
  Madison Square Garden in the Redverse is quarantined in amber.
• Timestamp: 16:52
  Part of Harvard University in the Redverse is quarantined in amber.
• Timestamp: 17:03
  "A Demon's Twist Rusts", written on the chalkboard in the Harvard lab in the Redverse, is an anagram for "Don't Trust Sam Weiss".
• William Bell in the Redverse was killed in a car accident as a young man. He never worked with Walternate.
• Fauxlivia's mother is alive but her sister died in childbirth. Olivia's sister is alive but their mother is dead.
• Timestamp: 29:45
  Peter can interface with the power source for the Machine.
• Bell created the Shapeshifters.

• Timestamp: 01:14
  Antoni Gaudi's cancelled 1908 New York hotel project Hotel Attraction has been built in New York City and is called The Grand Hotel.
• Timestamp: 01:33
  Madison Square Garden was quarantined in 1999.
• Timestamp: 01:53
  Liberty Island, location of the Department of Defense, was appropriated by the revised Eminent Domain provision of the Earth Protection Act in 1989.
• Timestamp: 02:09
  John F. Kennedy wasn't assassinated.
• Timestamp: 07:56
  Almost all of Boston has been quarantined.
• Timestamp: 12:00
  They have Kentucky Grilled Chicken.
• William Bell did not open Massive Dynamic in the Redverse.
• Timestamp: 14:39
  They have a "Red Lantern/Red Arrow" comic series (instead of "Green Lantern/Green Arrow"), "Superman: The Man of Steel Returns" (instead of "Batman: The Dark Knight Returns"), "Crisis on Infinite Earths" with Superman and Supergirl swapped, "Justice League Vol 1 1" with Jonah Hex (instead of Guy Gardner), and "The Death of Batman" poly bag (instead of The Death of Superman).
• Peter's kidnapping was a famous story in the Redverse, and they did not have the Lindbergh kidnapping.
• Timestamp: 15:58
  The Transamerica Pyramid is in the New York City skyline instead of in San Francisco.
• William Bell in the Redverse was killed in a car accident as a young man. He never worked with Walternate.
• Timestamp: 36:19
  A movie theater shows 'Superman Vs. Batman' and 'Indiana Jones & The Hex of the Hydra'.
• Timestamp: 34:23
  A movie theater shows 'Star Wars - Legion of the Droids'.
• Timestamp: 16:55
  Harvard University has a campus in Medford, MA.
• Timestamp: 34:49
  A movie theater shows 'Smokey & the Bandit: The Final Lap' and 'Mask vs. Joker'.
• They have huge bees (a nurse asked a patient "How big were the bees? This big? Bigger than a grapefruit?").