The dialog in the final scenes, starting with Staples' conversation with his wife in a coffee shop near his office, indicate the events take place well into the evening. However, the exterior shot linking this scene with Staples' confrontation with Ramsey in the Ramsey & Company building, as well as the exterior shot that follows the confrontation, were both taken in broad daylight.
Staples is repeatedly referred to as being "young" or a "young engineer". For a man who is obviously approaching 50, neither today nor then a credible designation. To fit, they should have chosen a considerably younger actor than Van Heflin.