The goof item below may give away important plot points.
We are told that Walt Kramer was Fred Waters' best friend, had grown up with Waters' widow (Sue), had introduced the two of them, and had served as best man at their wedding. As seen in the opening sequence Fred Waters is a Seaman Apprentice (E-2) making him relatively new to the Navy (less than 18 months) and Kramer is a Petty Officer First Class with at least six years of service. There probably was not enough time for Kramer to have introduced Sue to Fred in Hawaii as she was originally from out of state. This could have been fixed had they made Waters a more senior rank (e.g., second class petty officer).