When leaving Hank's room, Sandy alternates between having a bag on her shoulder and not having a bag on her shoulder in different shots.
All iPhones are clearly not being used for calls when characters have telephone conversations using them. Sometimes they are clearly on the home screen of the phone or on the dial pad of the phone--not mid phone call.
All coffee cups in the series are empty. This is clear whenever one character passes a cup to another and the sound of the character's hand making contact with the cup is amplified inside the empty cup.