While the castaways take precautions against a coming typhoon, an accidental blow to the head causes Gilligan's mouth to act as a radio receiver.
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Per the title, hi-fi or high fidelity was the term used by record enthusiasts to refer to high-quality reproduction of sound that had minimal amounts of noise and distortion and was generally applied to record players which possessed stereophonic sound. See more
At 5:46 of the episode, Gilligan is still supposed to be a radio and yet he speaks momentarily to Ginger and Mary Ann. Gilligan turns his head all the way to the right until he finally finds a position with no station. This allows him to talk normally. See more
Professor Roy Hinkley
[the cave the castaways sought shelter in just minutes before has been destroyed by a lightning strike
It's completely destroyed!
Jonas 'The Skipper' Grumby
[Speaking to Gilligan
Little buddy, we came out here to save you, and you saved us!
Referenced in Dazed and Confused