John McIntire's prosthetic shoe
At the beginning of the movie, John McIntire's character Albert Patterson is shown putting on or adjusting a shoe prosthetic with a sole about 2-3 inches thick. His other shoe has a normal sole, and although he walks with a slight limp, it's obvious the thick-soled shoe does not make his one leg longer than the other.
So, it's clear either John McIntire actually had one leg shorter than the other (neither his IMDB or his Wikipedia bio mention this affliction), or the prosthetic was a fake (actually a shoe with a normal sole but with the upper built up and the shoe exterior made to look like it had a thick-soled prosthetic). If the prosthetic was a fake, there was a reason for it, as it was prominently featured at the beginning of the movie and then never shown afterward (and never was mentioned at all, just the one scene where it showed him putting it on or adjusting it). And since movies never waste time showing insignificant material, it was featured for a reason.
So, on the hunch that it was a fake prosthetic and featured for a reason, I checked Albert Patterson's bio on Wikipedia. It mentioned that he was seriously wounded in France in WWI. So, this must be the injury that resulted in having one leg shorter than the other, and must have been a prominent and known feature of his personage, causing the person who played him in the movie to not only wear a fake prosthetic, but to even spend an entire scene demonstrating that he was wearing it.
So, the director went out of his way to pay homage to Albert's bum leg, but it was never mentioned why in the movie nor has it been mentioned here on IMDB, which appears to be a shortcoming. Oh well, at least it is there.
Come see a fat old man sometime!