When Joe is out jogging, he is being approached by two joggers coming the opposite direction. The first man has purple shorts and the second has purple jogging pants. However, after Joe is shown and camera returns to what Joe sees, the man in the jogging pants has completely disappeared.
When Bwick is painting, his feet are lowered into two bowls of paint. The bowls are not big enough for his feet, so only the tops of his feet get paint on them, yet when his feet are put on the canvas, the impressions are of two complete feet down to the heels.
Jane's shoes when she is at Joe's art show.
The cover and position of the picnic hamper on the Brooklyn Bridge.
Jane's blouse and Joe's shirt after they have been making out in her apartment.