Fringe Connections

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

Jones is working with Bell, who is alive.

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

In "And Those We've Left Behind" Astrid used the same wand to detect abnormalities that Lincoln used in the opera house in "Over There (Part 1)".

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

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

Olivia's pregnancy dream in "The Same Old Story" is in a waiting area with giant tulips. Young Olivia fled to a field with white tulips when she got scared in "Subject 13".

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

John Mosley's beanie in "The Arrival" has the 'green-green-green-red pattern' from "The Equation".

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

The butterfly glyph can be seen near Lincoln in the rail yard.

Nina communicated with an animated William Bell in "Brown Betty". When Walter and Peter found Bell in Olivia's mind in "Lysergic Acid Diethylamide" he was animated.

William Bell's name is partially faded/scratched off of the door to the lab.

Butterflies can be seen in Etta's apartment.

Walternate has three solid-color panels on the wall of his office in "Bloodline": blue, red, and yellow. These symbolize the two universes (blue and red) and the rewritten timeline without Peter (yellow) starting from "Neither Here Nor There".

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

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

The Glatterflug ad for daily flights to the moon in "Olivia" is the same air travel company as Flight 627 from "Pilot".

This episode reveals that there is more than one Observer. The intro sequence since the pilot episode has had a single frame that says "OBSERVERS ARE HERE".

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

Peter needed a Faraday cage to safely enter the time bubble in "And Those We've Left Behind" like Alistair Peck built into his own body in order to time travel safely in "White Tulip".

The opening crawl is an homage to Blade Runner.

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