I don’t know if it is the right place to write about css issues in the rtl layout.

Snapshot: http://img703.imageshack.us/img703/3889/99392434.gif
Location: wp-admin/edit-comments.php

1. “Check for Spam” button position – There is an extra 8px margin on top of the button.
2. “In reply to” should have a right float.
3. “Author” should have a right float.
4. “Un-spammed by” should have a left float.