I've just finished watching the film and enjoyed it again, the second or third time.
Right at the end of it though, seeing all the 35mm cassettes on the line, it made me think how much film is wasted en mass, just with the loading of a 35mm film into a camera. At least 2 to 3 frames each time, on average I would think. That would soon add up to millions of frames worldwide, which in turn being and an awful lot of silver wasted.
Of course it would cost money in setting up, but it must make financial sense to cut the above cost. I'm not sure how, but I envisage some form of paper or acetate end being attached to the start of the roll, thus saving the wasted frames. In a way, similar to one end of a 620 roll of film, but with sprockets.
I'm sure Ilford and other manufacturers must have thought about this over the years, and it's not possible, or on the other hand maybe they haven't?...
Terry S