When Annie goes through the metal detector at the Security Station, she neglects to take off her clunky metal watch yet she does not set off the alarm. There is no way that she could get a watch like that through a metal detector without sounding the alarm.
When Cassie and Max look in Alex's medicine cabinet, Max says "OxyContin" when the bottles clearly say Oxycodone. Also, Oxycodone does not come in a 30mg strength.