- Fake Nationality: The Arab Muslim Farik is played by the Jewish Israeli Oded Fehr. The Bosnian Illija is played by the half-French, half-Italian American Henri Lubatti. The Frenchman Christian is played by the Franco-American Alex Nesic (he holds dual US and French citizenship). The Iraqi Salim is played by the Iranian Omid Abtahi. It's lampshaded by Farik, who says he's passed for Iranian, Sephardic Jew and other ethnic backgrounds in the past.
- Romance on the Set: Alex Nesic (Christian) and Melissa Sagemiller (Gayle) started dating during the first season. Later they married and had a son.
- What Could Have Been: The show was first called The Cell during production.
Trivia / Sleeper Cell