lucy24 - 11:17 pm on Jan 14, 2012 (gmt 0)
Google does not clean house overnight. The Crawl Errors page alone can go back months. What matters is that the current crawls are getting the correct responses: 200 if it exists, 404 or 410 if it doesn't.
You can also go into the "remove from index" part of gwt and have whole directories removed from the existing index. But be careful not to remove the real page at the same time.