Fringe Connections

The universe window from "Peter" was seen in Walter's storage vault in "The Bullet that Saved the World".

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.

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

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.

Jones said there are 10 tests for Olivia in total. The first was a box of lights that Olivia had to turn off with her mind.

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

The merged wall paintings from "Jacksonville" 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.

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

Walter implanted a tracker in his neck in "Snakehead" which is used in "Grey Matters".

Peter's shared dream state with September looks like an observation deck.

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

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.

The crane that crashed during the intro has a Massive Dynamic logo on it.

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

Olivia's therapist in "Nothing as it Seems" is the same one she had when she was trapped on the other side in "Olivia".

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

A seahorse can be seen outside the entrance to the daycare center.

September was labeled as "Mr. X" on Walter's computer in "The End of All Things", the same name that fans used to refer to the man Peter freed in Olivia's mind in "Lysergic Acid Diethylamide".

Olivia struck James Heath with a candlestick in her dining room, making the title a complete red herring.

Butterflies can be seen on a box in September's apartment.

The ship at the end of "Nothing as it Seems" shows creatures from "Unleashed" in cages.

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