In the episode where Tom had an argument with his son and his son went to stay with the Jefferson's. The slip up is when the journalist comes to interviews George and Louise, when they are sitting on the sofa and she and George are arguing you notice her earring fall out of her ear on to the sofa and stays out of her ear for a few shots, when she stands up her earring is also not in her ear, but after a few over the shoulder shots you notice the earring is back in her ear.