Fringe Connections

Peter flipped a coin through his fingers in "Safe" like both Peters did when they were near death in bed in "Peter".

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

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

A flashback at the end of "Grey Matters" revealed that it was William Bell who removed the pieces of Walter's brain. In "Over There (Part 2)" Bell said he removed the pieces at Walter's own request due to fears about the man he was becoming.

Windmark visited his boss, The Commander, in 2609.

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

In "And Those We've Left Behind" Peter picked up the same toy plane (perhaps not literally the same) that he played with in "Subject 13".

In his dream at the end, young Peter is in bed wearing a jersey with the number 96 on it. The number 96 is the same jersey number that Joshua Jackson wore as Charlie Conway in the Mighty Ducks trilogy.

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

The End Dock Stabilizer's lights in "An Origin Story" flashed the 'green-green-green-red' pattern from "The Equation" when Peter finished assembling it.

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

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

In "The Ghost Network" Roy had visions of the crash of Flight 627 from "Pilot", suggesting that that incident is part of a larger pattern of incidents and not a one-off event.

The cuneiform on the boat door says "bí".

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

September's device in "A Short Story About Love" led Peter to the beacon from "The Arrival".

Who did the Observer say was "still alive," Peter or Walter?

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

The opening scenes of "Letters of Transit" reference Casablanca (a man named Rick owning an upscale nightclub). Peter and Fauxlivia watched Casablanca together in "The Abducted".

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 outside the entrance to the daycare center.

Cecil mentions the Observers using a light bomb in "Through the Looking Glass and what Walter Found There", which is what Loyalists threw at Peter in the sewer tunnels in "The Bullet that Saved the World".

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

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