I agree Summers, it was a revelation to stumble across this pioneering film, which still has some of the finest examples of the technique I have seen. A real master class.
Those are two great exemplars you mentioned. And it's interesting how at 13:15 it's a jump cut to the wide shot in its entirety, which is done very well.
And John is correct. The entire catalogue of the National Film Board of Canada is really quite a treasure trove of free clinics with the masters.