The Machine experiences a glitch during rebooting, supplying Reese and Fusco with the numbers of dozens of people not actually involved in crimes, while also locking Finch and Root out after identifying them as threats based on past violent behavior.
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There is a flashback along the timeline, but since the Machine is, for the moment, unable to differentiate the past from the present, the moment is designated as "Day R", with the letter 'R' displayed in "Blackboard bold" (a.k.a. "double struck") typeface style, because that is the convention used in Mathematics to denote the set of Real numbers. Real numbers can, of course, be thought of as points on an infinitely long number line. And the Machine is unable to pinpoint the flashback moment's place on the timeline. See more
While Reese is pinned down by the hit woman he has a phone conversation with Finch. In the conversation Reese tells Finch he is out of ammo and the scene clearly shows his handgun with the breech fully open indicating the weapon is empty. In the next sentence of the same conversation we see the handgun again with the breech closed. See more
You're Harold Finch. You'll find a way into the system.
The title sequence starts with the usual Harold voice-over, but then the audio and video "glitch" and "crash", symbolizing the malfunctions the Machine is experiencing. See more
References The Terminator