in der comments.php versuch mal das rauszunehmen
<td align="right" width="110">Name: </td>
<td><input type="text" name="author" id="author" value="<?php echo $comment_author; ?>" size="30" tabindex="1" /></td>
</tr>
<tr>
<td align="right">Email: </td>
<td><input type="text" name="email" id="email" value="<?php echo $comment_author_email; ?>" size="30" tabindex="2" /></td>
</tr>
<tr>
<td align="right">URL: </td>
<td><input type="text" name="url" id="url" value="<?php echo $comment_author_url; ?>" size="30" tabindex="3" /></td>
</tr>