Fringe Connections

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

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

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

September loads his food with heat (pepper, jalapenos, hot sauce) in "The Arrival" because his emotions are dulled, as he explained in "The Boy Must Live".

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 seahorse can be seen on Peter's luggage.

The Glatterflug ad for daily flights to the moon in "Olivia" is the same air travel company as Flight 627 from "Pilot".

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

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

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.

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

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

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".

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.

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

The intense amount of Cortexiphan coursing through Olivia in "Brave New World (Part 2)" was able to heal her mortal wound. This was foreshadowed in "Brown Betty" when Olivia was sliced by the same weapon that killed Rachel, yet instead of dying Olivia's skin started to heal itself.

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

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

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".

Peter's grave says he died when he was 7.

The leaf glyph is on the electronic keypad at Massive Dynamic.

An ambering device, first (nearly) used by the Blueverse Fringe team in "6B", was seen in Walter's storage vault in "The Bullet that Saved the World".

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

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