Fringe Connections

Olivia shot her captors in "The Human Kind" with the bullet she took from Etta in "The Bullet that Saved the World".

Observers send materials to themselves via shipping lanes from the future using metal cubes.

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

In "The Box" Bell wrote to Nina in his will "And for the precious few we had alone in Tuscany, a memento of me." In "Five-Twenty-Ten" Bell's old safe had a picture of Nina in Tuscany.

The opening crawl is an homage to Blade Runner.

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

Fauxlivia studied old Fringe cases for intel in "The Box", including Olivia's taped testimony from "Dream Logic".

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.

A butterfly can be seen attacking Mark Young.

In "Brave New World (Part 1)" Walter sat in his old cell at St. Claire's from "Pilot".

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 flower can be seen outside the entrance to the daycare center.

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)".

The yellow dot in the final glyph of the episode is replaced by a yellow heart.

Butterflies can be seen in Etta's apartment.

In "6:02 AM EST" Walternate trapped Fauxlivia in the same cell as Olivia was kept in in "Over There (Part 2)".

When Walter explains that his red/blue lensed glasses were created by his friend from Washington, Doctor Jacoby, he's referencing the television show 'Twin Peaks' which also had an eccentric man of science, Doctor Jacoby, who wore red/blue lensed glasses very similar to Walter's.

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

In "Liberty" the Fringe team used the universe window from "Peter" to help them rescue Michael.

Donald entered the mine 5 weeks after the invasion and took some rocks. He was described as being in his late 30s, medium height, dark hair. Donald said he was waiting for "a colleague, a scientist from Boston, to meet him." Observers found him and took him away.

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

Walter visited Peter's grave in "There's More Than One of Everything" from when Peter died in "Peter".

Donald helped Walter set up the pocket universe hiding spot.

A seahorse can be seen in Walter's Monty Python trip.