Continuity mistake: When Burt arrives home Milly gets up from her desk and we can see two magazines at each end of the coffee table with other items between the magazines. There is only one magazine closest to the door and three magazines at the other end and the cigarette box has moved closer to the three magazines. Then a magazine vanishes from the stack of three and the cigarette box has moved over and close to the outside edge of the coffee table.
Continuity mistake: Milly is sitting up in bed with a pillow behind her. As the camera angle changes from facing her to behind her the position of the pillow keeps changing. In a shot of her the corner of the pillow is below the top of the headboard. The camera cuts to behind her and the corner of the pillow is above the top of the headboard. Burt walks in and sits on the bed causing the pillow to drop below the top of the headboard, but when the camera cuts to behind Milly the corner of the pillow is again above the top of the headboard.
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).
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.