1. Probably cached pages. Clear all your site caches from the Joomla menu 'System > Clear Cache'.
2. Google tries to follow all links it can find. Those 'results...' should be from following the links from your pagination settings for the list box in the 'Configuration > Templates' page. However, your example looks strange to me, because the number is descending (results, 458-547). In general those pagination links indexed by Google don't hurt at all, because the pages actually exist and their source code includes a canonical url.