When the terrorist Bassam announces the plan, the murmurs of assent from the group include the audible word "aywa." This word for "yes" is unique to the dialect of Arabic spoken in Egypt and identifies the speaker as an Egyptian.
The trivia item below may give away important plot points.
At the beginning of the episode, Gibbs has a dream where Kate is dead on the table in autopsy. She had a bullet hole between the eyes, the exact way Kate was killed later on in season 2 by Ari the the terrorist featured in this episode.