Last night I watched a great little short documentary by Jon Ronson on the archive of boxes Stanley Kubrick left behind after this death. The boxes contain vast amounts of research for his films (both completed films and those that never made it off the ground), threatening crank letters, odd memos from Kubrick to his staff, and much more.
It’s a fascinating insight into the level of minute detail Kubrick obsessed with, which definitely shows through in his films. I think above all a producer/director needs to be concerned with detail.