Many changes were motivated by the vast improvements in CGI technology and other production techniques that occurred in the two decades after the original trilogy was produced. In a September 2004 MSNBC article, Lucas points out that the original films were '25 or 30 percent' of what he intended. The commercial success of Star Wars has given George Lucas the opportunity to tinker with his original trilogy, now called Episode IV A New Hope, Episode V The Empire Strikes Back, and Episode VI Return of the Jedi. The following are partial lists of changes in Star Wars re-releases.

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