How-to Video: Working With the wp_head() and wp_footer() Functions in WordPress4 Comments
The wp_head() and wp_footer() functions are important parts of any WordPress theme, but some theme authors neglect to include one or both of these functions.
For SlideDeck (and many other plugins) to work correctly these functions must be present in your theme’s header.php and footer.php files. This screencast shows you how to troubleshoot and repair this issue.
One interesting thing to note is that it’s possible for a basic, custom WordPress theme to work without a wp_head() and wp_footer() function. If your theme doesn’t have these, it’s not broken but it is incomplete.
If you’re having issues where jQuery is being loaded more than once, check out this screencast on double jQuery.