I don't often find much of interest on StarWars.com. In fact I don't even bother visiting. But I came across it by accident the other day and found an interesting, if short, vignette entitled, "Episode IV: Averting Disaster". It's an excerpt from the Empire of Dreams documentary from the Star Wars Trilogy 2004 DVD set.
Unfortunately you can't embed clips from StarWars.com, so follow the link below if you're interested.