Great film made by people who had long history of making great films. "Rushes" or rapid prints of the days shooting were b&w and I have no idea if that changed, but as high contrast pushed (speedy development) review footage maybe just mechanistically it influenced shot design? There's another doc somebody did analysing raiders and treasure of the sierra madre shot by shot.
Do you have the link to the documentary?
Isn't loading fast enough for me to be sure this is the one. Its a comparison, and interesting.