Olivia's attempt to return to the Blueverse was thwarted when the Opera House was ambered.
The Observer can be seen passing Henry's cab after Olivia enters the park where she expected to find the Redverse's Massive Dynamic.
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Items of Interest
President Kennedy was a UN Ambassador.
Olivia entered "Martin Luther King/Eldridge Cleaver Memorial Park" which has a plaque quoting them as saying "We have a dream" rather than "I". (Image 1)
The penny-farthing Olivia saw in the park is both a difference between the Blueverse and Redverse and a reference to the cult science fiction television show The Prisoner, in which a recurring plotline is the attempt to reprogram the mind of a government agent. (Image 2)
Henry Higgins is the name of the lead male character in George Bernard Shaw's play 'Pygmalion' and the musical/movie 'My Fair Lady' based on it. He is tasked with changing a woman so that she fits in with high society.
There's a Slusho! ad on the gas station window. (Slusho!) (Image 1)
They have the musical DOGS instead of CATS.
Tom Cruise is a TV star, not a film star.
Massive Dynamic does not exist.
Shell and Exxon have merged into Shexxon.
People are playing cricket in the park, implying that cricket is a common sport in Redverse America.
People ride penny-farthings.
The Department of Defense seal has no eagle and has swords instead of arrows.
Walter ate an oreo.
WALTERNATE: "Somehow this girl came here. Somehow she is equipped to move through universes. We need her to help us understand this skill because if we can do it we can win this war."
A visualization of all the ways this episode connects to other episodes. Scroll down to see the actual connections.
S1E01 - Pilot
The Glatterflug ad for daily flights to the moon in 'Olivia' is the same air travel company as Flight 627 from 'Pilot'.
S1E11 - Bound
Olivia has excellent aim in 'Bound'; she killed Loeb's wife with a single shot to the head. It's stated in 'Olivia' that Fauxlivia won an Olympic gold medal for marksmanship.
S2E21 - Over There (Part 1)
In 'Olivia' they gave Olivia the same tattoo as Fauxlivia had in 'Over There (Part 1)'.
Spoilers for future episodes below!
S3E04 - Do Shapeshifters Dream of Electric Sheep?
Senator Van Horn was questioning Peter about his experiences with Walternate in 'Olivia'. Van Horn was revealed to be a Shapeshifter in 'Do Shapeshifters Dream of Electric Sheep?', so his questioning of Peter was likely for intel.
S3E05 - Amber 31422
COLONEL BROYLES in 'Amber 31422': "Sir... It's a tragic, but a small price to pay for the greater good. People understand that." WALTERNATE: "Perhaps. But if they were to find out that the amber victims could be removed and resuscitated, I'm afraid the outcry would be akin to revolt." COLONEL BROYLES: "Quarantine victims are alive?" WALTERNATE: "Theoretically."
People think that those who are ambered are dead; a group protested ambering the opera house in 'Olivia'. The public doesn't know that amber victims are actually alive.
S3E22 - The Day We Died
Peter offered to "save" Senator Van Horn's pen with a special trick when it was just about out of ink in 'Olivia'. Van Horn laughed at him for caring to save a pen and then Van Horn just let it die. This foreshadowed Peter's attitude toward the Redverse in 'The Day We Died' where he found a way to save the alternate universe and fix its problems rather than let it continue to decay and ultimately die.
S4E16 - Nothing As It Seems
Olivia's therapist in 'Nothing as it Seems' is the same one she had when she was trapped on the other side in 'Olivia'.