The animation is taken from all the official shorts Disney has been posting. They have been rearranged to put into the order of the movie and combined. As near as I can tell, the Japanese dialogue is taken from the official Japanese movie dub. The result isn’t perfect, but it is a lot of fun.

Edit: Sony Japan had the previous video removed. LucasArts (and now Disney) is usually ok with fanedits, but evidently Sony Japan isn’t so ok with their music being used in fanedits. Oh well. I’ve updated the link to a different fanedit that does the same thing.