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Ashes to Crashes: Ron's corpse is fed to the shark, because Peter knows the shark will be killed by what's inside of Ron.
California Doubling: Some Italian movies set in America were actually entirely filmed there (such as Impatto mortale and Thunder); this one was shot in Georgia... and Malta.
Dolled-Up Installment: The film was released in Spain, Brazil and Japan as a part of the Jaws series. Which is one of several reasons why Universal took the film's American distributors to court in a (successful) bid to have it pulled from cinemas.