The opening scene shows a rough sea with 20 foot waves as the boats approach the beach. Once the boats are on the beach, the water behind them is calm.
In the establishing shots of the oiler and its "customer" during a night underway replenishment ("unrep"), the navigational lights - the sidelights, the masthead lights, and the special-purpose lights - which are digitally superimposed on a modified daytime photograph - are completely wrong.