Character mistake: In every scene George is with Mary, she never once wears glasses. However, when he meets her coming from the library after he was never born, she is wearing glasses. George is shown how he has influenced all the people in Bedford Falls over his lifetime, but having Mary's eyesight degrade to the point of needing glasses isn't one of them.
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Suggested correction: It's possible that working in the library in low light for years may have accelerated a decline in her eyesight that might not otherwise have occurred in the original timeline.
