I've been noticing 404 errors on my site looking for /wp-content/plugins/google-analytics-for-wordpress/images/yoast-logo-rss.png.
Line 288 of yst_plugin_tools.php is attempting to load that logo in the dashboard widget, which is showing a broken image:
echo '<a href="http://yoast.com/" title="'.__('Go to Yoast.com').'"><img src="'.$this->plugin_url.'images/yoast-logo-rss.png" class="alignright" alt="Yoast"/></a>';
There is no file of that name in the plugin images directory. So it looks like either that file should be present or the code should be loading the image from yoast.com instead of the local site.