Fringe Connections

The Porcupine Man from "Nothing as it Seems" was seen in Walter's storage vault in "The Bullet that Saved the World".

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

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

Olivia's mindscape in "Lysergic Acid Diethylamide" shows an area with Iraqi architecture, a reference to when Olivia met Peter in Iraq in "Pilot".

The green and yellow posters in the diner represent how this new timeline with the yellow/amber title sequence is starting to merge with the original timeline with the blue title sequence now that Peter has returned (blue + yellow = green).

The hand glyph can be seen on the piano stool in the Orpheum Theater in the Redverse.

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".

Bell stole Walter's David Bowie album 'The Man Who Sold the World', which describes what Bell did multiple times for his own benefit.

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

Olivia has excellent aim in "Bound"; she killed Loeb's wife with a single shot to the head. It's stated in "Olivia" that Fauxlivia won an Olympic gold medal for marksmanship.

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

A seahorse pattern can be seen in the toxin's molecular structure.

A butterfly shadow box like those seen in "The Dreamscape" was seen in Walter's storage vault in "The Bullet that Saved the World".

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

Walter looked at Peter's coin in "Novation" from the night Peter died in "Peter".

Olivia pulled up a list of the frozen heads found in S02E04 'Momentum Deferred' and they were all marked with "2E204", a reference to the episode in which they were stolen.

Butterflies can be seen in Olivia's bedroom.

Walter's password at Massive Dynamic in "Letters of Transit" is 0-5-2-0-1-0, the same as the combination to the Jacksonville daycare center and to Bell's safe in "Five-Twenty-Ten".

Susan Pratt's wardrobe is full of dark colors like Olivia's and Nick Lane's.

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

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".

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

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