Fringe Connections

The Observers read Broyles' phone call from the impressions his sound waves made on the glass in his car in "An Enemy of Fate", like Peter did in to hear the phone call Nancy Lewis made in "The Road Not Taken".

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.

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

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

The episode ends with September going into December's apartment, apartment 513, the episode code of the next and final episode of the series.

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

James Heath met with Lloyd Becker, a fellow Cortexiphan subject, in "Olivia. In the Lab. With the Revolver.". The name "Lloyd B." was on the height chart in "Jacksonville".

Walter's pose as he listens to the Mozart Requiem is a reference to the iconic Maxell tape advertisement from the '80s.

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

Right before Alfred Hoffman grabs an apple from the Bishops' refrigerator in "The Bishop Revival" there is a Rubik's Cube with three greens and one red on its side, a reference to the 'green-green-green-red' pattern from "The Equation".

Michael can show emotion as he cried when he saw Nina's dead body.

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

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

Marshall Bowman had a disk in his hand like John Scott and the woman in 'The Ghost Network'.

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

Olivia's pregnancy dream in "The Same Old Story" is in a waiting area with giant tulips.

The briefcase contained photos of Walter.

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

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

Windmark visited his boss, The Commander, in 2609.

Butterflies can be seen in Etta's apartment.

Walter hid the beacon at the tombstone of his father, Robert Bishop, in "The Arrival". Robert Bishop's work and history is central to the plot of "The Bishop Revival".

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

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