Character mistake: In her speech outside the bank, Mary Lou Barebone mentions "the wireless" as one of the wonders of modern technology, which is the British term. A New Yorker in 1926 would more likely use the Americanism "radio."
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Possibly, but is it probable? Big difference between hearing someone else use it and using it oneself. Just as an example, if I ever were to travel to Britain, it would be an instinctive habit to use words like "elevator" instead of "lift", or "apartment" instead of "flat", simply because to me, as an American, that's what they're called.