CComment Core 5.0.1, default template, joomla 2.5
Adding comments enabled only for Registered.
As public you can see links 'quote' and 'reply'. When you click of there there is a JS error:
quote: TypeError: form.comment is undefined
reply: TypeError: form.getElement(...) is null - form.getElement('textarea').focus();
When there is a message like 'you are not allowed to add comments' links quote/reply shouldn't be available.