Trivia: Despite receiving prominent billing, Christopher Lee has only 3 minutes of screen time, with only 4 lines.
Trivia: Jeremy Bulloch, who portrayed the bounty hunter Boba Fett in The Empire Strikes Back and Return of the Jedi, has a cameo as Captain Jeremoch Colton piloting the Tantive III.
Trivia: Darth Vader's helmet was symmetrical for the first time in a Star Wars film, as it was made by a machine - the original was hand crafted and was slightly aspherical.
Chosen answer: Powerful force users seem to have some degree of control over their bodies even after death. In the later series, Luke's wife Mara Jade Skywalker only allows her body to disappear when her killer, and nephew Jacen Solo arrives at her funeral as a clue. Thus it appears that a powerful force user can simply choose if they wish their body to disappear.
Darius Angel