Fringe Connections

The rollercoaster seen from atop the World Trade Center in Olivia's mind in "Lysergic Acid Diethylamide" is a reference to the one she rode with Ella in "August".

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

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

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".

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.

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

The ship at the end of "Nothing as it Seems" showed the creatures from "Snakehead".

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

The bus in "The Ghost Network" is ambered. Ambering later becomes a real safety tool used by the other side as seen in "Over There (Part 1)".

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

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

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".

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

The anti-gravity osmium bullets from "Os" were used as a weapon against the Observers and Loyalists in "An Enemy of Fate".

Sam Weiss died 10-15 years earlier in a shootout with Observers trying to protect the radio signal relay used to locate Michael.

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

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

Windmark said "Nothing grows from scorched earth" to Walter and then later Walter saw a dandelion growing from rubble outside. He has hope.

The seahorse glyph can be seen on the back of one of Markham's books.

Walter thought of Peter when he saw the image of a coffin in "Grey Matters" because his Peter died in "Peter".

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

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