It's called Deleted Magic. Really, really well done and fun to watch.

Having said that, in my opinion, the movie is MUCH better without the deleted scenes. They are plodding, and remove some of the mystery that makes the first film so effective. One of George Lucas' greatest strengths, and also one of his faults, is that he wants to show you everything. The tight editing and leaving some of the details open to imagination worked out for the best. I'd go so far as saying it was editing that made the difference between a fun film, and one of the greatest films of all time. It didn't win an academy award for editing for nothing.