Fringe Connections

Markham took a liking to Olivia when they met for the first time in "Ability". Decades later in "Transilience Thought Unifier Model-11" he buys her when she's stuck in amber.

The green and yellow posters in the diner represent how this new timeline with the yellow/amber title sequence is starting to merge with the original timeline with the blue title sequence now that Peter has returned (blue + yellow = green).

A butterfly can be seen attacking Mark Young.

A bus at the second crime scene in "The Plateau" has an ad on the side that says "Ambered", a reference to the ambered bus in "The Ghost Network".

Windmark visited his boss, The Commander, in 2609.

Butterflies can be seen in Etta's apartment.

Joseph Meegar is able to control electronics around him in "Power Hungry" like the Observers can, such as August starting a car with his finger in "August".

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

The flower glyph can be seen on the wall in Karen Truss's house.

Michael played the music box from "The Boy Must Live" for September after September got shot in "An Enemy of Fate".

Olivia entered "Martin Luther King/Eldridge Cleaver Memorial Park" which has a plaque quoting them as saying "We have a dream" rather than "I".

A frog can be seen on the dock when Walter is high.

The creature from "Snakehead" and images of it were seen in Walter's storage vault in "The Bullet that Saved the World".

William Bell left Massive Dynamic to Walter.

A seahorse pattern can be seen in the toxin's molecular structure.

The Porcupine Man from "Nothing as it Seems" was seen in Walter's storage vault in "The Bullet that Saved the World".

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

The leaf glyph is on the electronic keypad at Massive Dynamic.

In "Back to Where You've Never Been" Peter and Lincoln set up the universe portal in the Orpheum Theater, the same place Walter, Olivia, and the Cortexiphan subjects crossed over to rescue Peter in "Over There (Part 1)".

In his dream at the end, young Peter is in bed wearing a jersey with the number 96 on it. The number 96 is the same jersey number that Joshua Jackson wore as Charlie Conway in the Mighty Ducks trilogy.

The butterfly glyph can be seen on the wall in the diner where Olivia and Lincoln meet.

September's security system flashed the 'green-green-green-red' pattern from "The Equation" before exploding in "The Boy Must Live".

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

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