Fringe Connections

The creatures from "Snakehead" were used as a weapon against the Observers and Loyalists in "An Enemy of Fate".

The opening crawl is an homage to Blade Runner.

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

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".

Nick Lane's wardrobe is all dark colors like Olivia's.

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

Peter found Olivia in a field of white tulips in "Subject 13", a nod to "White Tulip".

The green and yellow posters in the diner represent how this new timeline with the yellow/amber title sequence is starting to merge with the original timeline with the blue title sequence now that Peter has returned (blue + yellow = green).

The hand glyph can be seen on the piano stool in the Orpheum Theater in the Redverse.

The neon green fairy seen in the black market in "Transilience Thought Unifier Model-11" is like the green fairy Walter hallucinated in "Black Blotter".

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

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

Ten Observers are present on Liberty island in "The Day We Died" from an assumed total of 12, given their names. One of the missing two is August, who was killed in "August".

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".

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

In "The Cure" David Esterbrook has an aleph pin on his jacket that can also be seen on the canoe from Olivia's dreamscape in "Pilot".

The license plate on Olivia's SUV reads 1R2D21, and the licence plate on Broyles's SUV reads 1C3PO1.

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

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".

When Nina looks in Bell's storage room for his copy of the First People book the camera pans by a copy of 'Dr. Spock's Baby and Childcare'.

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

Nick Lane is being kept in a coma indefinitely at the end of "Bad Dreams". In "Over There (Part 1)" Olivia learned that he and other found Cortexiphan subjects have been training to keep their abilities under control.

Olivia entered "Martin Luther King/Eldridge Cleaver Memorial Park" which has a plaque quoting them as saying "We have a dream" rather than "I".

A seahorse can be seen on Peter's luggage.