Thank you for the plugin.
Testing Theme Mentor on the current BuddyPress Default theme (BP 1.6.4), there are notices which are valid but one notice should not be included in results:
wp_head call should be right before the closing head tag. at file header.php, line 13
wp_head is called right before closing head tag as you can see here https://buddypress.trac.wordpress.org/browser/tags/1.6.4/bp-themes/bp-default/header.php