If you download any Pre-Janauray Design template from http://www.asp.net/mvc/gallery/default.aspx?supportsjs=true and trying to test with latest MVC Release (after following ReadMe.txt), chances of you getting an ugly error like below are real high.
So how to make these template with new version? You can with very few changes to site.master page (This following example is for Bluebubbles template but this may work for most of the templates)
Page Directives After Changes
Head Section Before
Head Section After Changes