[4] In episode four, "Choke Hold", one of Sergei's associates is sent to the United States to kill a Russian scientist who refused to work with him.

Anton Pavlenko (previously seen in "Twenty Klicks"), portrayed by Lev Gorn, a Russian counselor, reappears in this episode.

[6] On June 11, 2014, at the Cannes Film Festival, NCIS was cited as being the most-watched drama in the world, with 57.6 million viewers worldwide.

Gary Glasberg, the executive producer of the show, said, "As NCIS enters its 12th season, we couldn't be happier to learn we're now the #1 drama in the world.

[8] When a DDoS attack crashes the Internet in Washington, DC, NCIS asks for help from three hackers they had previously encountered: Ajay Khan ("Canary"), Kevin Hussein ("Twenty Klicks"), and Heidi Partridge ("Page Not Found").

Surprisingly, two of Gibbs' ex-wives (Diane (Melinda McGraw) and Rebecca (Jeri Ryan)) show up at one of the crime scenes to discuss something important with him.