This episode follows the aftermath of Olivia's journey to the parallel universe while also introducing shapeshifters. After her shocking return to this reality, Peter Bishop, unknowingly in a race against time with an ominous mobile force, pursues information about Olivia's visit.
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Olivia was sent back to our universe in this episode after meeting with William Bell in one of the Twin Towers in the Redverse in the previous episode.
The Observer crosses the street near the car crash.
A pirate flag (skull and crossbones) appears on a TV monitor in 'There's More Than One of Everything', a reference to the Shapeshifter ability to remodel his skull and bones in 'A New Day in the Old Town' (which was filmed directly after this episode).
The car crash in 'A New Day in the Old Town' happens in front of a business called "Gruno & Dunder", an anagram for "underground", foreshadowing the killer's location in 'Night of Desirable Objects'.
Olivia was told details about the location of Newton's head and she remembered those details in "Momentum Deferred".
Walter's real son, who died in "Peter", was the one who loved custard.
The Greek phrase "Na einai kalytero anthropo apo ton patera tou" that Olivia uttered in "A New Day in the Old Town", which was something Elizabeth used to say to Peter, translates to "Be a better man than your father."
