Factual error: McGarrett places the kidnappers' ransom tape on the reel-to-reel recorder, and before the tape is threaded or the machine properly turned on, the message immediately starts to play.
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Trivia
Theresa's letter from Immigration is signed by "James Heinz," an in-joke. Heinz, in real life, was Hawaii Five-0's associate producer. See more...
Updates: 
Series 4
Tiger By The Tail (season 1, episode 5)
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