That may have been because they were projecting 16mm, where you very often would see the entire frame. If it was shot in 16mm, the director was probably thinking about the whole frame, and if it's a reduction, it's likely that the frame was filled to maximise relevant information.HerrSchreck wrote:I've seen rounded corners in projections, most memorably at the MoMA.
Another factor with old films that might have been cobbled together from multiple sources, or dupes of dupes, is that the 'projected area' on the print you happen to have in your hands might not be the same thing as the intended projected area on the original negative - in which case it's surely desirable to retain as much of the image as possible, especially if you strike instances like this which look particularly suspicious.