Revealing mistake: When Charlie is writing her letter we can see it through a hidden camera in the pen she is using. By watching the angle on how the camera would be attached to the pen we know that she would have seen the camera. Also her hand would be blocking the camera view, so we shouldn't be able to see anything at all. (00:30:30)
Continuity mistake: When the fake sheriff enters the basement we can see he leaves the door open. When it cuts to wide shots we can see in both wide shots that the door is closed. Then it appears open again later. (01:22:00)
Continuity mistake: When they are gathered around the dinner table and Rex says "we are this close to the million dollars, guys." you can see him pointing his finger with his elbow up. When it cuts he is pointing but now his elbow is down. (00:19:00)
