Character mistake: About half-way into the movie the Captain asks for a fathometer reading and is told 150 fathoms. He preforms a mental calculation and says that it is 310 meters and over a thousand feet. In fact, 150 fathoms is 275 meters or 900 feet (1 fathom = 6 feet = 1.83 meters). (00:57:15 - 00:57:40)
Character mistake: When Cary Grant enters Deborah Kerr's apartment he greets her by saying, "Hello Debbie." Kerr is Terry.
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Suggested correction: He says "Hi, Terry", calling her by the right name.