Continuity mistake: Milly is on the balcony with Mr. Hanson. The sliding glass doors behind them are not fully open and the drapes are drawn well past the door opening. When Mr. Hanson stands up, the camera cuts for a closer shot and the sliding glass door is now fully open and the drape is drawn to the door opening.
Continuity mistake: During Virginia's visit, when Milly walks over to a chair we see on the coffee table a couple of magazines with an ashtray on top. The top magazine is white on the end closest to Milly and the spine is facing the camera. As soon as Milly sits down the camera cuts and the top magazine now is dark on the end closest to Milly and the spine is facing away from the camera. (It appears the top magazine was rotated 180° between shots.) After Virginia has handed the envelope to Milly, the camera cuts away and the top magazine has returned to its original position (white end closest to Milly and spine facing camera).