Fringe Connections

The combination to Bell's safe in "Concentrate and Ask Again" was 0-5-2-0-1-0, the same combination used in "Five-Twenty-Ten".

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

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

Markham took a liking to Olivia when they met for the first time in "Ability". Decades later in "Transilience Thought Unifier Model-11" he buys her when she's stuck in amber.

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 as Olivia and Shapeshifter Charlie fight in the alley.

In "Grey Matters" Walter's brain pieces were stored the heads of living people. In "Letters of Transit", in the altered timeline, they were stored in Massive Dynamic.

It is true that the Empire State Building's spire really was initially designed for airship docking as it was in the Redverse.

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

The radioactive isotope compound from "The Cure" that caused heads to explode was used as a weapon against the Observers in "An Enemy of Fate".

Carr's work review sent to Astrid from his previous employer shows that in the three years prior to his dismissal, he only missed three days of work. He was out for only one day each year and each year it was the same day: Valentine's Day.

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

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".

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

Butterflies can be seen in Olivia's bedroom.

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

There is a Massive Dynamic logo on Flight 627's engine.

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

In "Back to Where You've Never Been" Peter and Lincoln set up the universe portal in the Orpheum Theater, the same place Walter, Olivia, and the Cortexiphan subjects crossed over to rescue Peter in "Over There (Part 1)".

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'.

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

Despite Walternate's efforts to mold Olivia's mind into Fauxlivia's, Olivia kept seeing Peter and Walter in "Amber 31422". Similarly, in "Alone in the World" Peter didn't exist in the rewritten timeline yet Olivia kept having visions of him.

Michael can show emotion as he cried when he saw Nina's dead body.

A seahorse can be seen on Peter's luggage.