Video on how Walt Disney cartoons were made around 1930:
http://www.youtube.com/watch?v=mhfp6Z8z1cI
Full-Length video of "Steamboat Willie":
http://www.youtube.com/watch?v=BBgghnQF6E4
The History of Mickey Mouse:
http://www.youtube.com/watch?v=KGdLkl1Alpc&feature=related