Did you know that the Google Webmaster Tools report for crawl errors, specifically the 404, page not found report, is ordered in priority order?
I didn't know that but supposedly that was the way it always was. Google will order the errors they find on your site in their crawl errors report by order of importance or priority.
Here is the snippet of the video:
Many SEOs and webmasters, including myself, did not know that.
Forum discussion at Google+.