Fringe Connections

Senator Van Horn, who died in "Do Shapeshifters Dream of Electric Sheep?", was still alive in the altered timeline and talked to Broyles in "Brave New World (Part 2)".

When Nina looks in Bell's storage room for his copy of the First People book the camera pans by a copy of 'Dr. Spock's Baby and Childcare'.

Butterflies can be seen in Olivia's bedroom.

The child needed an air degradation unit in "Through the Looking Glass and What Walter Found There" because he needed a less oxygen-rich environment like where he was found underground in "Inner Child".

The license plate on Olivia's SUV reads 1R2D21, and the licence plate on Broyles's SUV reads 1C3PO1.

The butterfly glyph can be seen on a door in the pocket universe.

Patterns drawn on cards from David Robert Jones's box of tests for Olivia in "Ability" bear a resemblance to the stasis runes used in "Brave New World (Part 2)". Very little is known about either.

Madison Square Garden in the Redverse is quarantined in amber.

A seahorse can be seen on Peter's luggage.

Olivia's mindscape in "Lysergic Acid Diethylamide" shows an area with Iraqi architecture, a reference to when Olivia met Peter in Iraq in "Pilot".

There are 'Wanted' billboards for the Fringe team.

A hand can be seen on the wall when Olivia and Peter attack the Observers and Loyalists.

Ten Observers are present on Liberty island in "The Day We Died" from an assumed total of 12. One of the missing two Observers might be John Mosley, a potential former Observer, who was killed in "The Arrival". See the FAQs for more information (note: FAQs contain spoilers through season 5).

Peter's grave says he died when he was 7.

The frog glyph can be seen as Olivia and Shapeshifter Charlie fight in the alley.

The creatures from "Snakehead" were used as a weapon against the Observers and Loyalists in "An Enemy of Fate".

It is true that the Empire State Building's spire really was initially designed for airship docking as it was in the Redverse.

A butterfly can be seen painted on the side of a white trash can.

The End Dock Stabilizer's lights in "An Origin Story" flashed the 'green-green-green-red' pattern from "The Equation" when Peter finished assembling it.

Mark Young's colleague is wearing a butterfly pin, possibly prompting the subject of his hallucination.

The apple glyph can be seen as Olivia and Shapeshifter Charlie fight in the alley.

There was a white tulip in Walternate's bedroom in "Immortality" when he was struggling with what he had to do to save his world, suggesting that the symbol has meaning for him just like it did for Walter in "White Tulip".

Olivia pulled up a list of the frozen heads found in S02E04 'Momentum Deferred' and they were all marked with "2E204", a reference to the episode in which they were stolen.

A seahorse can be seen on the Bishops' refrigerator.