C.O.D. is the acronym for Cash on Delivery: payment at the time services are rendered or an item is delivered.
Finch mentions H-SAID (Homeland Security Automated Identification Database), a (fictional) data collection system which stores information about travelers, such as addresses, FBI clearances, and biometric data. Similar data management systems implemented by the U.S. Department of Homeland Security, ESTA and US-VISIT, exist in the real world. Both programs require non-U.S. resident travelers to submit biographical data prior to, and biometric data such as fingerprints upon arrival in the United States.
The place where Reese and Fermin retreat to after the ambush was filmed at the underpass of the Manhattan approach to the Macombs Dam Bridge. It is not the Queensboro Bridge as identified on the Machine feed.
C.O.D was originally titled "Hack".
Bloopers and Continuity Errors
When escaping the Estonian mob, the taxi hits the Estonian vehicle with the left side of the cab, but we later see the right side as the damaged side.
When John arrived at the arranged place with the taxi driver to make a deal with the hacker, it was 19:32. Later they ran into a fight and almost at the same time Fusco received a threatening call from Simons. According to Fusco's watch, it was around 20:10. Then he got a mail from Simons which according to the screen monitor was sent around 17:00.
When the blond Estonian woman pulls out a 100 dollar bill, it originally appears real, however, in the following close up shot and when she drops it for the cab driver, it's clearly a fake with no detail.
Simmons sends Fusco security camera footage of him and Ian Davidson in the IAB vault to blackmail him into helping HR. However, the first thing Fusco did upon entering the vault in “Blue Code” was to black out the cameras.
"For You" by Trilogy featuring Fred The Godson (In the bar where Finch meets D3MON8)
"I recognize their methods. Had a similar experience in Russia. It was a kill box. Didn't work out too well for them. Disabled the GPS. Can't risk them accessing it to track you down." (Reese)" Who are you?" (Fermin) "Just a guy who needed a ride." (Reese)
"I hacked the Cuban government database. Surprisingly sophisticated software. No doubt curtesy of the Russians." (Finch) "Don't tell me Fidel Castro's really dead?" (Reese) "Actually, yes! And his body double has cancer." (Finch)