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Thank you very much Dana for the superb answer!

any clue for how much this errors are critical for my website seo? (is this problem worth fixing)

Hi there,

iv been tracking my webmaster tools crawl errors for a while now(6 months) and im noticing some pages that are far gone 404 are still poping out on the crawl errors. - that pages have no data for xml linking, and remote linking are from pages that are far gone 404 also.

that pages have 404 error page + redirect to homepage, and google still notice them with old cache content.

does someone have a clue why is this happening?