Please read for an updated status on RailsCasts:
Learn more or hide this
GitHub User: dchun
I figured out the issue with coffeescript not woking properly. On a Rails 4 app you will run into problems where it appears there is some conflict with turbolinks. Just use jquery.turbolinks and you should be good. Find the solution here: http://stackoverflow.com/questions/17881384/jquery-gets-loaded-only-on-page-refresh-in-rails-4-application
Great screencast! One issue I am running into however, is the submit buttons reappearing when returning back to the page after having left. Any ideas on a fix?