Continuity mistake: When Tess opens the lockbox at the beginning and realises the key is missing, she goes from having her left hand on the box to off it instantly between cuts when she finally gets it open.
Continuity mistake: The first time Tess tries to open the lockbox with the key inside when she gets to the house, the way she is touching/holding it changes between cuts. Specifically, she goes from only having one hand on it to both hands.