When Harry sits down with Leona in the bar, he orders two beers. When the waiter brings the beers, one glass is just over half full with beer with foam up to the top, while the other has more beer plus foam. When Hannigan comes in from the cock fight (after a cut-scene), both beer glasses are full with only about a half-inch of foam.
When Harry goes to look at the plaques and pictures on the wall, the positions of some change between the longer shot and the close-up where he straightens the picture of the PT boat - most noticeably the plaque with his medal ribbons.
Leona carries all of her suitcases by herself at the dock. She wouldn't have been able to do that unless they were empty.
When she first steps onto the boat, Patricia Neal's voice is heard saying "we're off to sunny Mexico," but her lips aren't moving.