it was one of the add-ons to the new DVD release(I just bought the Full Screen version last week) here are the changes to the DVD release
Episode 4: A New Hope:
- 24m 51s into the film: twin sun effect has been added.
- 48m 50s: Han Solo avoids Greedo's shot before shooting at him.
- 50m 30s: Jabba the Hutt computer animation changed in accordance with Episode 1.
- 71m 30s and after: Death Star detention-block corridor is much deeper.
- 77m: Dianoga (trash-compactor monster) has been improved.
- 82m 10s: "Power" and "Tractor Beam" English words have been replaced with Star Wars "Basic" language.
Episode 5: The Empire Strikes Back:
- 50m 56s to 52m 05s: The Emperor's hologram has been replaced with Ian McDiarmid. New dialog has been recorded whereby Palpatine informs Vader about Luke's real identity.
- 63m 42s, 87m 18s and 98m 39s: Boba Fett's dialog has been replaced with Temuera Morrison‘s (Jango Fett from Attack of the Clones) voice over.
- 92m 05s and 92m 15s: Han Solo's black jacket has been erased, due to cut mistakes in the original movie.
- 101m 40s: Luke's scream, which was added in the 1997 Special Edition, has been removed again.
Episode 6: Return Of The Jedi:
- 24m 44s and after: Edge transparency defects around the Rancor have been removed.
- 115m 41s: Old Anakin's eyebrows have been erased and eyes are now blue, to fit with Hayden Christensen.
- 120m 44s: Naboo has been added to Tatooine, Bespin, Coruscant and Endor victory celebration scenes.
- 120m 58s and 121m 03s: Senate and Jedi Temple are now included in Coruscant panoramic view.
- 122m 30s: Hayden Christensen (Anakin) appears as a ghost beside Yoda and old Obi-Wan at the end of the movie.
credit -
http://www.supershadow.com/