Sharon's hair changes color from black to brown & back again as the film progresses.
Sharon's weight fluctuates as the film progresses. This is especially noticeable when Sharon is dressing for her first date with Robert. She is rather slim. When she plays tennis with him a few scenes later, she is noticeably heavier.
When Sharon confronts Robert about being broke, we see Robert grab his answering machine & smash it. There are no cords attached to the answering machine.