Carl's father-in-law introduces himself as "Jim Hunt, Petty Chief U.S. Navy, retired." There is no such thing as a "Petty Chief" rank in any service. The correct Navy ranks are Chief Petty Officer, Senior Chief Petty Officer, or Master Chief Petty Officer.
Although throughout the film, Ed Harris's character is called Paul Blaylock, in the end credits he is shown as Peter Blaylock.
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