Here's a special behind-the-scenes look at Mickey's Christmas Carol. It was released on home video in the mid-1980s alongside the special itself. It even managed to find its way onto the Mickey In Living Color DVD set on the Walt Disney Treasures line as a bonus there. Enjoy!
And as another bonus, here's an intro to this special when it was shown on network TV (NBC, in this case) and shown with other holiday-themed (or at least winter-themed) Disney cartoons: