Calleigh is talking to the little girl in the store, and her hair when viewed from behind is not tucked behind her ear, whereas from the front her hair is tucked behind her ear.
In one scene in a lab, character Ryan Wolfe, played by actor Jonathon Togo, is talking to the character Natalia Boa Vista, played by actress Eva LaRue. Jonathon Togo calls the character Eva, her real name, instead of Natalia.