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Another article in the Financial Post of passing interest ... Review of a new Glenn Gould CD. It seems that, "Using the most sophisticated equipment, the CBC started cleaning up some acetate air checks of a 1955 Glenn Gould performance of Bach's D minor Piano Concerto from Massey Hall. [Incredible acoustics, vile sight lines - an incredible old firetrap across from the Eaton Centre downtown] As the hiss and crackle were stripped away, a buzzy nattering voice was uncovered. It turned out to be crosstalk from a broadcast of a Maple Leafs hockey game a few blocks north. As it was unremovable, the CBC simply researched the game and score, and included it in the liner notes."
For what it's worth, Maple Leaf Gardens is just east of the College Street subway stop, Massey Hall just east of and halfway between the Dundas and Queen stops, which makes them about seven relatively short blocks apart.