When Sherry first checks in with her P.O., she signs the receipt for her property's return with her real name Maggie Gyllenhaal and not "Sherry Swanson".
During Sherry's second conversation with her brother Bobby on the pay phone at the halfway house, she is holding the phone's receiver in her right hand and her cigarette in her left hand. However, just before she terminates the conversation we cut to a closeup and she is now holding her cigarette in her right hand and her left hand has crossed her body and is holding the receiver to her right ear.