John Mueller from Google announced on the Google Webmaster Central blog that they've updated the crawl error reports specifically to handle better reporting on redirects.
In the past, Google reported the error observed at the end under of the first URL (URL A in diagram below). Now, instead they report it at the final URL (URL B in diagram below).
John Mueller summed it up on Google+ saying:
The short version is that we'll be showing these errors for the final destination URL instead of the redirecting URL, which hopefully makes things a bit easier to diagnose.
Many webmasters are happier with this change because it makes it easier for them to diagnose the crawl errors on these redirects.
Forum discussion at Google+.