Trivia: The password Finch chose for activating the virus, "Dashwood," is significant in that it is the last name of the main two characters in Jane Austen's novel Sense and Sensibility, which was the book Finch used in his proposal to Grace in the flashbacks.
In the first scene after the second commercial break, the character that is supposed to be dead, is clearly alive. You can see the actor's abdomen rise and lower like he's breathing.
During the opening sequence of this episode, Fusco is now identified by the Machine as a PRIMARY ASSET with the corresponding yellow box, as Fusco now knows about the Machine.
Trivia: At the end of the episode, the Machine identifies Fusco with a yellow box for the first time. A yellow box indicates that the target knows about the Machine's existence.
Trivia: Reese mentions that Enright is at the safehouse taking care of Delia. Enright was the Number in "Critical" that the team helped, a surgeon and cardiologist.
Trivia: The door password to the new underground Team Machine operations base is 3141 (PI).
Trivia: Lambert gives his first name as Jeremy.
Trivia: Scarface's real name, Anthony, is finally mentioned onscreen.
Trivia: Hersh's first name is revealed as George.
Trivia: Collier's real last name is Brandt.
Trivia: John Greer and Senator Garrison meet in front of a painting: Hieronymous Bosh's famous triptych "The Garden of Earthly Delights" which is in the Prado museum in Madrid.
Trivia: Right before Control starts cutting Root, the Machine signals "Sorry" in Morse code.
There is no Lassiter, IA, in the vicinity of Cedar Rapids or anywhere else in the state.
The Machine's initial review of events includes a surveillance camera shot of Root in the library cage. However, Finch is deliberately keeping Root out of contact with The Machine. Even without sound, she could easily communicate with The Machine via camera in several ways, from lip-reading to writing down a message (if she is allowed paper and pencil) to arranging book covers to form messages.
Trivia: Hersh's full name of Robert N. Hersh is given in The Machine's final display.
After Root pets Bear, Bear walks over to Finch and sits in front of him. The camera cuts to Root, and then back to Finch and Bear is now sitting behind him.
When Finch talks to Root near the end of the episode, his right hand switches between being in his pants pocket, then out, then back in again.
When Carter hijacks the truck, she picks up her duffel bag. However, in the next shot it is lying on the ground behind her. In the next shot from the rear, she has the bag again.
Trivia: Root's known aliases are Veronica Sinclair, Kelly Dyson, Jane Von Neumann, and Caroline Turing.