In real life, Barbara Bain is claustrophobic. Hiding in the serving cart was very difficult for her.
During the apartment scene, Akim mentioned that Karl de Groot is the only non-Muslim allowed into the Holy City. But no explanation is given as to how Phelps seemingly has free access to the city and the cafe owned by Jara, prior to his "association" with Ibn Borca.
Some of the dossier scene in this second-part episode is taken from Action! (1967). As a result, the order of the agents selected is slightly different than it was in Part One. Judging from which dossiers are on top of others, the agents are selected in the following order: Willie, Cinnamon, Barney, Rollin, and Akim. In Part One, Akim was selected first, then Rollin, Cinnamon, Barney, and Willie--in fact, if you look closely, you can see Rollin's dossier under Akim's when Jim selects Akim.
Percy Rodrigues(Jara) starred in Court Martial (1967)(#1.20). He is one of several actors from this series to also star in Star Trek (1966).