During the rescue scene where George steers the catamaran over the semi-conscious David, a close up of George right before he falls into the ocean shows that he is wearing prescription eye glasses. He tumbles into the water, and quickly emerges, now wearing sun glasses.
When George (Dudley Moore) is sitting on beach watching Jenny (Bo Derek), in the close-up shorts there is a woman beside him lying on her back wearing a yellow bikini, but in the long shots there is no one near him. In the long shots, you can see a woman some distance away (right side of the screen) lying on her stomach wearing a yellow bikini bottom, but apparently topless.
After George is caught at his neighbor's orgy, he returns home and tries to call Sam and then his psychiatrist. The reflection of a man in sunglasses can be seen in the window just above and to the left of the telephone in the low-angle shots.
When looking through the telescope the picture moves around as if being moved by George. But when it shows George looking through, his hands are behind his back as if he has made no attempt to move the telescope.