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This is Season 3, Episode 20, which comes after the last
episode you indicated you've seen. Just about every section below may spoil you.
if you actually have seen this episode.
This episode follows the activation of the doomsday device by the parallel universe and the subsequent devastating consequences experienced by our world.
Synopsis provided by the Fandom Wiki, Fringepedia, and Wikipedia.
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The Observer can be seen at the park where Fauxlivia walked around with Henry.
Timestamp: 13:59
A poster in Olivia's mind in 'Lysergic Acid Diethylamide' that says "Be Vortex Aware" foreshadows the vortex that consumed part of a ranch in '6:02 AM EST'.
Timestamp: 12:28
Timestamp: 19:19
A drink
S3E20
Timestamp: 08:46
Similar phenomena started happening in "6:02 AM EST".
Walter got angry in "Peter" when Carla Warren spoke that same Oppenheimer line at him.
S2E22
Timestamp: 42:35
S3E20
Timestamp: 41:04
The Observer was orchestrating a plan to test Walter. At the end of the episode he discussed the event with December.
In '6:02 AM EST', as Walter struggled with the idea of allowing Peter to enter The Machine, he recalled the words of the Observer.
Sam Weiss told her that in "Concentrate and Ask Again".
A radio broadcast from the Redverse in "6:02 AM EST" mentioned the Dodgers playing at Ebbets field in Brooklyn.
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