Catching things like "he" instead of "be" isn't too hard. The really nasty ones are where letters have been joined up by the OCR process, so you get things like "dock" instead of "clock", "comer" instead of "corner" (that's a REALLY nasty one to spot), and so on.
I find that it helps to proof with a much larger text size than you'd normally read with, to make these errors stand out.
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