Fringe Connections

Nina communicated with William Bell through the universe window from "Peter" in "Brown Betty".

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

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

Ten Observers are present on Liberty island in "The Day We Died" from an assumed total of 12. One of the missing two Observers might be John Mosley, a potential former Observer, who was killed in "The Arrival". See the FAQs for more information (note: FAQs contain spoilers through season 5).

When Walter explains that his red/blue lensed glasses were created by his friend from Washington, Doctor Jacoby, he's referencing the television show 'Twin Peaks' which also had an eccentric man of science, Doctor Jacoby, who wore red/blue lensed glasses very similar to Walter's.

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

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

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

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.

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

A seahorse can be seen hanging from the taxi when Walter listens to music.

Senator Van Horn, who died in "Do Shapeshifters Dream of Electric Sheep?", was still alive in the altered timeline and talked to Broyles in "Brave New World (Part 2)".

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 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".

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

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

Walter used the clapper to turn on the lights in "In Absentia". He installed it in "Midnight".

The opening crawl is an homage to Blade Runner.

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

Walter and Donald hid the Child from "Inner Child" in the pocket universe in "Through the Looking Glass and What Walter Found There".

The Fringe team is part of a full-fledged branch of the Department of Defense in the Redverse.

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