During production on a episode or film, it is done through a process called Progression Reel.

It shows how the film is done from one stage to the final version.

This feature was kept in all releases the DVDs Big Idea released up until Duke and the Great Pie War.

Most of them simply show the differernces from the storyboard to the final show. However, some of them show the different types of animation that's used in the process (eg. Layout and animation)


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