When Mitch discovers Catherine's dead body, her left leg changes position between shots without Mitch touching it.
When Mitch and Catherine discuss starting a relationship, Mitch is alternately holding/not holding a fork between shots.
When Mathers gathers up Katherine's belongings, he leaves behind a bottle of nail polish and some mints. These items disappear from the towel between shots.
In one shot of Mitch working with Katherine to plug the leak in the boat, he is wearing a weight belt that he was not wearing before.