@Scot I think that refers to if the rss feed contains extract and not full text. One way to do it would is to add:

$comment_array = get_approved_comments($post->ID);
if ($comment_array) {
$content .= "<p><strong>Comments</strong></p>";
foreach($comment_array as $comment){
$comment_type = get_comment_type();
if ($comment_type == 'comment') {
$content .= "<strong>".$comment->comment_author." said:</strong><br />".apply_filters('the_content',$comment->comment_content);
}
}
}

to the rss-make-pdf-newspaper.php file after line 171 which starts $content = str_replace(']]>', ']]>', $content);