I'm using latest Jetpack with WordPress but I'm unable to get the Comments and Sharing to work with the Carousel. Publicize via Facebook and Twitter is working for posts.
It seems the comments form remains hidden on the carousel. I've replaced the theme's comments.php content with just this:
<?php comment_form(); ?>
Also I cannot see the share buttons for media / galleries while this options is enabled in Jetpack Sharing module.
See example at http://mstreboradice.cz/17-4-2013-dopravni-hriste/