During the opening credits, there are always words that describe goals of fringe science, and what the season is going to cover. They might be far-fetched in our world and difficult to achieve. In seasons 1-4, these were words like quantum entanglement, philosopher's stone, time paradox, worm holes, teleportation, suspended animation, artificial intelligence, transcendence, cytogenetics, and hive mind.
In series 5, the words represent the new improbable: Community, individuality, joy, education, imagination, private thought, due process, free will, ownership, and freedom. Words in the opening sequence that formerly represented dreams of a mad scientist or avid sci-fi fans now represent humanity's lost ideals.
The glyphs for this episode spell out: DOUBT
In this episode, Walter calls his lab assistant Astrid by the wrong name ("Afro"). This is a part of a running joke on the show where Walter repeatedly calls Astrid by the wrong name.
Around 36 mins, Peter sprays something into a lock, then inserts something into the tumbler and twists hard, breaking the lock open. This is actually a technique for breaking locks since the components are typically hardened but can become brittle when cooled. A can of compressed air or other coolant could lower the temperature of the lock components enough to make them become brittle enough to break the lock.
Henrietta is the daughter of Olivia and Peter. Perhaps, like the son of Alternate Olivia and Peter, Henry, she is named after Henry Arliss Higgins, who helped both Olivias. She also goes by "Etta" and her cousin, the daughter of Olivia's sister Rachel, is named Ella. Etta James and Ella Fitzgerald are both American jazz singers.