In the beginning of the movie after Lisa and Reuben are wed they fly to the St. Barts airport. The aircraft shown landing at the airport lands on the "displaced thresh-hold" and not on the actual area of the runway designated for landing. Displaced thresh-holds at airports are used for taxiing and allow more room for take off but are not available for aircraft to land on.
When Polly and Reuben are arguing in the boat, equipment can be seen reflected in the television on the wall to the left of Polly. This cannot be Reuben because he is completely opposite of Polly at the time.