The boat that knocks Clair out of her kayak leaves a noticeable wake, which Hobie swims through. It then cuts to an overhead shot of him, and there is no wake.
When Clair tells Hobie how sweet he is, she puts her left hand on his arm and her right hand on her left wrist. It then cuts to a close-up of her left hand and the right one is not visible.
After Lani and Donna order the champagne, the waiter appears with the bottle and two glasses slightly less then two seconds later.
As a blonde, Clair is obviously wearing a wig. Her hair is longer, thicker and wavier than it is after she dyes it.