Your reference to night scenes reminded me of the "cheat" that filmed TV shows did all too common in the 60's.....they'd film night for day! (to quote Truffaut) Seems they used a filter of sorts on the camera lens....watch for sharp shadows that belie the fact that it was shot during the day.....it's VERY obvious once you know what to look for. They may have done this for budgetary reasons or perhaps to increase the contrast level for B&W, not sure which.