Fringe Connections

Bell was unwell and needed oxygen in Olivia's memories in "Momentum Deferred" which could be because he had lymphoma as Nina revealed in the alternate timeline in "Brave New World (Part 1)".

The flower glyph glitches away after the scene where Olivia's fear caused her to interrupt all the electronics in the room.

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

In "Black Blotter" Walter had a vision of his scuffle with Nina at Reiden Lake from "Peter" and later recalled other memories from that day.

Who did the Observer say was "still alive," Peter or Walter?

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

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).

The episode opened in "Manhatan", seemingly a typo but actually signifying this was an alternate Manhattan.

A seahorse can be seen hanging from the taxi when Walter listens to music.

The bus in "The Ghost Network" was ambered. Huge sections of cities were ambered in the Redverse in "Over There (Part 2)".

Windmark visited his boss, The Commander, in 2609.

Butterflies can be seen in Olivia's bedroom.

Ten Observers are present on Liberty island in "The Day We Died" from an assumed total of 12, given their names. One of the missing two is August, who was killed in "August".

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

The apple glyph can be seen on the backrest of a chair in the lab.

The hallucinogenic drug from "The Dreamscape" was used as a weapon against the Observers in "An Enemy of Fate" to make them think they were being attacked by butterflies.

There is a Massive Dynamic logo on Flight 627's engine.

The butterfly glyph can be seen outside the entrance to the daycare center.

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

All of the people in Olivia's mind wear blacks and greys because Cortexiphan subjects have a strong desire to blend in.

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

Parts of Officer Gillespie from "Fracture" were seen in Walter's storage vault in "The Bullet that Saved the World".

Carr's work review sent to Astrid from his previous employer shows that in the three years prior to his dismissal, he only missed three days of work. He was out for only one day each year and each year it was the same day: Valentine's Day.

A leaf can be seen on the bio-scan monitor at the Liberty Island security checkpoint.