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This is Season 3, Episode 15, which comes after the last
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This episode explores Walter and Elizabeth Bishop's attempts to return Peter to the parallel universe using the Cortexiphan-induced abilities of young Olivia Dunham, while Walternate in the parallel universe struggles to deal with the kidnapping of his son.
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Young Olivia inadvertently switching universes when trying to find Walter is what finally revealed to Walternate where his son Peter had been taken.
The Observer can be seen in the lobby of Bishop Dynamic.
Timestamp: 31:41
The "Tulip Food Store" signage in '6B' foreshadows Olivia and Peter meeting for the first time in a field of tulips in 'Subject 13'.
Timestamp: 00:52
Timestamp: 19:46
Timestamp: 31:18
Timestamp: 43:06
Timestamp: 39:53
Seahorse
Timestamp: 31:19
S3E15
Timestamp: 33:00
These innate skills are what the Cortexiphan drug trials attempted to bring forth in children in "Subject 13".
Olivia didn't remember being in the trials as a child in 'Subject 13'.
Walter and Elizabeth tried very hard to gaslight Peter and make him forget and disregard any thoughts he had about his kidnapping and his real home in "Subject 13".
S3E15
Timestamp: 33:00
S2E21
Timestamp: 23:35
S3E15
Timestamp: 03:39
S2E22
Timestamp: 14:34
S3E15
Timestamp: 28:30
We learn in the very next scene that Walternate ignored his wife's requests to repair their marriage. In "Immortality", many years later, Walternate had a Japanese mistress named Reiko.
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