In the beginning you can see Joe(Gaius Charles) is in his Navy uniform and his National Defense ribbon is off center sliding off his ribbon holder.
Laura and Joe are in Grand Central Station and the voice on the loud speaker says "Rockville Center, Babylon..." which are stops on the Long Island Rail Road, which only goes to Pennsylvania Station not Grand Central.
When Joe (the sailor) toasts his shipmate at the stag party on the plane, he refers to the shipmate as "Ensign" Wiley. However, Wiley is in an enlisted uniform, with the rank of Fireman (E3), not that of an Ensign, which is an officer (O1), and should have been referred to as "Petty Officer".
Laura says she's drinking a Sloe Gin Fizz and holds up a pale yellow cocktail. Sloe Gin is dark red and a Sloe Gin Fizz can be anywhere from bright red to bright pink, depending on how much Sloe Gin is poured. She was more likely drinking a Tom Collins which is also made with Gin, is pale yellow and was a popular drink in the 60s.