Buster did a lot of television later in his life, and so much of it seems to be based on pie throwing. The irony is I can't remember a single pie throwing incident in any of his major films! I know he did so with Arbuckle and perhaps on stage and maybe in some shorts he did later on, but in his major independent work? Not one of his specialties.
I agree, you can hear the bitterness in his voice, and I don't blame him. MGM really didn't know how to handle the guy after THE CAMERAMAN.
I wonder if he ever had any run ins with The Three Stooges while he was at Columbia?