Director Kevin MacDonald finally managed to persuade the surviving terrorist Jamal Al Gashey to talk on camera after eight months of fitful negotiation and numerous aborted meetings in secret locations. Al Gashey specified certain conditions prior to their actual meeting in an Arab country insisting MacDonald was to travel alone, not to inform anybody where he was going and provide a wig and moustache for Al Gashey to disguise himself when in front of the camera. The interview piece used in the documentary was filmed by somebody Al Gashey trusted.
When One Day in September (2000) premiered at the Telluride Film Festival, Eric Bana was in attendance with his film Chopper (2000). Bana had seen One Day in September (2000) and read books on the subject. He would later go on to portray the lead role of Avner in Munich (2005) a film about the Israeli response to the 1972 Munich Olympics.