when joe is having coffee w/ the pretty sister in the coffee shop (at the beginning of the movie) joe goes to put creamer in his coffee. He is holding it by the handle first, the camera angle changes, when it goes back he is holding it by the top, camera changes again and when it goes back, it is by the handle again.
ok, so you have obviously not seen this movie more than once......he is not having coffee with his sister.....he had just had a phone conversation with his sister though. I would really hope that the girl he met in the coffee shop was not his sister...otherwise that would have been incest later on in the movie....maybe you should re-watch it a little more closely next time.