Many, many, many pros would shoot test shots on Polaroid at shoots to get a baseline idea of what stuff would look like. Without the instant feedback we have now with digital, you had no idea what it would look like after developing so it was incredibly common to shoot a fair number of Polaroids to help gauge light levels and balance, etc. Obviously very few of these were used for anything but a rough reference, but pro photogs of the time would definitely have had plenty of polaroid film around.