Fringe Easter Eggs: Observer in The Box

The Observer can be spotted in the Fringe episode The Box, entering the train station, just as Newton is leaving.

You can see all of The Observer's other appearances here.

Fringe Easter Eggs: Glyphs in The Box

The Glyphs code in the Fringe episode The Box spelled out ALERT, which combined with last weeks clue spells out "Amber Alert", and seen on this bus in Olivia.

For more information on the Fringe Glyphs, check out Fringepedia's Glyph / Symbols page, which has all the previous glyphs and codes.

Fringe Easter Eggs: The Return of Glatterflug

In the Fringe episode Olivia, there is a scene where Olivia stops the taxi and has the driver go and buy her clothes. Above the doors of the store, you can see a sign advertising Glatterflug airlines:

Daily Flights to the Moon
GLATTERFLUG
Don't give her diamonds, give her the moon.

The name "Glatterflug" is butchered German for "Smooth Flight", and has been seen before in season 1. The Pilot episode's disastrous flight was aboard Glatterflug Flight 627, and Olivia even flew Glatterflug to Germany in the episode In Which We Meet Mr. Jones.

The interesting fact here is that in the alternate universe, Glatterflug flies to the moon on a daily basis. On the other hand, they still use zeppelins. It's a strange world...

Fringe Easter Eggs: Observer in Olivia

The Observer can be spotted in the Fringe episode Olivia, at the park where Olivia goes unsuccessfully to find Nina Sharp at the Massive Dynamic building.

You can see all of The Observer's other appearances here.

Fringe Easter Eggs: Glyphs in Olivia

The Glyphs code in the Fringe episode Olivia spelled out AMBER, as in the "Amber Response" protocol used to quarantine the Opera House.

For more information on the Fringe Glyphs, check out Fringepedia's Glyph / Symbols page, which has all the previous glyphs and codes.