Continuity mistake: Shannon lobs a watermelon at the dealer's back and knocks him down. The watermelon lands and just splits open. Shot changes as he asks Shannon what she hit him with and sees a large chunk, about half, of the watermelon next to his head. Just moments before, the melon was not that broken. Shot changes again and that large chunk is gone.
Continuity mistake: Sarah tries to help a choking restaurant customer by cutting into his throat and inserting a straw. Blood starts squirting out onto her shirt, and her hands are completely covered in blood. But then when Shannon and Sarah are in the parking lot, there's no blood to be seen. She may have thoroughly washed her hands, but her shirt should have had blood still on it.
Continuity mistake: Shannon gets Sarah to drink at a bar. Shannon starts helping tip the glass to make Sarah drink faster. One shot shows enough drink in the glass still to be touching the bottom even when turned down. Shot cuts to different perspective and there's suddenly much less drink in the glass.