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President John F. Kennedy very frequently set up recording machines during meetings at the White House. Much of the dialogue from the movie is taken directly from Kennedy's tapes.

President Kennedy wanted an eyewitness account so badly that Commander Ecker was ordered to the Pentagon to brief the Joint Chiefs of Staff immediately after landing his RF-8A Crusader, sweaty flight suit and all. This is often thought to be a glaring error in the movie, but his attire is absolutely accurate. Cdr. Ecker was not even allowed to exit his Crusader when he landed at NAS Cecil Field, Jacksonville FL. His film canisters were unloaded from his aircraft, he was refueled and sent immediately to Washington D.C., landing at Andrews AFB and whisked by limousine directly to the Pentagon where he met with the Joint Chiefs of Staff, apologizing right away for appearing at the briefing in his sweat-soaked flight suit. Cdr. Ecker, parched from the Cuba overflight and then the flight north to Washington, asked in a hoarse voice for a drink of water when he arrived. He refuses it in the movie.

Edited from Trinity and Beyond: The Atomic Bomb Movie (1995)