For the second question you need to look at your plugins - Suffusion or even WordPress don't have options for adding sharing icons at the bottom of posts/pages. Your site use AddThis, so check if this plugin have an option to not add automatically those icons at the end of posts/pages. If not, uninstall the plugin and look for another which have this posibility (there are tens of plugins for this purpose)...
For the first - my guess that is another problem related to your plugins, or maybe to an edited file of theme. Because the message of Suffusion on the pages/posts with comments closed is: "Sorry, the comment form is closed at this time." not "Comments are closed".
Also in your source you have these lines, which aren't in original post-footer.php:
- Code: Select all
<!-- You can start editing here. -->
<!-- If comments are closed. -->
<p class="nocomments">Comments are closed.</p>