When Gail and Chuck get out of his car after their date, they walk through a shadow of the camera.
About thirty minutes into the picture, Mr. Macaulay gets out of his car and is greeted by Gail. Studio lights and fixtures are clearly reflected in the high gloss of the car's driver's side door. (This is why most cars in films appear to be dirty or have a dull finish.)
Mrs. Macaulay tells Joan her birth certificate is in a "sealed" box. There is a lock on the box, but Joan opens it without a key. Her mother never mentions needing a key. There is a very good reason that box should have been locked. Mr. Macaulay produces a key later and locks the box.