Fringe Connections

James Heath, a Cortexiphan subject, couldn't control his abilities in "Olivia. In the Lab. With the Revolver.". In "Over There (Part 1)" he had been trained to cure disease instead of cause it.

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

A seahorse can be seen on Peter's luggage.

Etta clutched her necklace, a bullet, when she saw Walter for the first time and when talking about her parents in "Letters of Transit". This is the bullet Walter shot at Olivia in "Brave New World (Part 2)".

Madison Square Garden in the Redverse is quarantined in amber.

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

The password to retrieve Michael in "Black Blotter", "Black Umbrella", came from the poster for Singin' in the Rain, from which September chose his new name (Donald O'Connor) in "The Boy Must Live".

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

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

The laser knives that the Observers nearly used to operate on Michael in "Liberty" were used by Mr. Gemini in "Brown Betty".

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

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

William Bell had a bell on his desk in "There's More Than One of Everything" and rang it after he introduced himself to Olivia. He left a similar bell to Nina in his will in "The Box".

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

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

Walter used the same neural halo in "The Box" as he used on the child in "Inner Child".

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

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

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

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

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

Joseph Meegar is able to control electronics around him in "Power Hungry" like the Observers can, such as August starting a car with his finger in "August".

The Fringe team is the First People. Walter sent the parts of the machine back through time via the wormhole in Central Park. That's why the First People had such a knowledge of Peter and Olivia.

A butterfly can be seen attacking Mark Young.