According to the Federal Trade Commission's website: "The FTC looks at what the ad does not say - that is, if the failure to include information leaves consumers with a misimpression about the product. For example, if a company advertised a collection of books, the ad would be deceptive if it did not disclose that consumers actually would receive abridged versions of the books." So I think there's a very valid claim to be made.
Personally, I think that there's a lot of this going on in the DVD industry... a friend of mine noted that his Happy Days Season One set doesn't have a disclaimer on the outside of the package that music was changed in some episodes (though there is a disclaimer on the inside of the package). Such disclaimers should be visible to the consumer before he purchases the item.
Of course, the only result of this would be either a recall of the Star Wars DVDs from stores (as Paramount did with its release of Star Trek: Generations) or a label to be affixed to each package.