Why on Youtube there are scenes not showed in the Making Of (for example, this one)? Are there several Making Of?

There is a Making of featurette that came with the Premium DVD set with actor interviews and etc.

The one that you saw from that Youtube link is one of the short video clips from the Taiyou no Uta website which documented the shooting of the movie with text production diaries plus some images and video clips.

I actually ripped all images and SWF videos from the site in an all-in-one package. You can download them here:

http://yui-lover.com/index.php?showtopic=4302&hl=

There sendspace and zupload links are dead, but Megaupload still works.

Great, thank you very much!

Edit: I'm glad sendspace doesn't work anymore, the server is nearly always full xD