I stumbled on this a couple days ago, its an early rough cut of the movie. Its interesting to notice all the changes, some subtle, some not so much. The shots range from fully rendered to story board. Some shots Still have the scratch vocals and sound effects.
youtube.com/watch?v=xR1YYo2hKYU
youtube.com/watch?v=VdSqSSKdBK8
youtube.com/watch?v=xqL-kCcHyIo
They’re pretty darn cool.
cool find! I always like to see what Pixar movies look like early on in animation 
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I noticed in the 3rd video that they put in part of Alan Silvestri’s score from Back to the Future when Woody was running down the stairs because the actual music for that scene probably wasn’t finished yet.
And that’s why you almost never see the original storyboard reels, even on DVD extras – getting the rights to the music isn’t worth the $$$, so it’s only ever seen internally.
yeah but often times when that happens they can just replace with the the actual sound track, since they no longer need a temp track.