When Sherry visits her parole officer at the start of the movie she states that her brother lives at 1334 Ridge Street. At the end of the movie, after Sherry drops Lexie off, the number on the post outside her brother's house clearly reads "1642."
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.
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".
When Sherry and Alexis are sitting under the bed after dinner, Sherry's "I thought so" does not match her mouth.