add_action('get_footer', 'please_help');

function please_help () {
    global $wp_query;

    $post_count = count($wp_query->posts);
    $is_404 = (is_404() == TRUE ? 'true' : 'false');

    echo "<pre>
    Post count: $post_count
    is_404(): $is_404
    </pre>";
}