Easter egg: On Disc 1, go to the options menu and highlight the THX logo. Type in 11, 3 and 8 and you will be led to a funny clip of Yoda hanging out with the clone troopers.
Continuity mistake: In the scene where Anakin arrives on Mustafar and tells R2-D2 to stay with the ship, he pulls the hood of his robe over his head with two organic hands. His right hand should be mechanical. [This mistake is mentioned in the audio commentary: this shot is taken from a shot of Obi-Wan later in the film when leaving Padme's apartment. Still a mistake, though.] (01:32:55)
Darth Sidious: [To Yoda.] I've been waiting a long time for this, my little green friend.
Trivia: General Grievous is permanently coughing when he talks. The cause is revealed in the last episode of the animated Emmy-winning TV series "Clone Wars" (albeit technically no longer canon). In that episode, Grievous kidnaps Palpatine and before leaving, is attacked by Mace Windu, who destroys part of his chest armour, making him cough for the first time.
Question: When some Jedi die, they disappear (Yoda, Obi-wan). When others die, they don't (Qui-gon, Vader). Why is that? I thought this phenomenon would be explained in this movie, but unless I missed something, no explanation was given.
Answer: Towards the end of the movie Yoda tells Obi Wan that Qui Gon has learned the path to imortality and offers to teach this to Obi Wan. In the Clone Wars TV series we see the journey Yoda takes to learn this power. The power to become one with the force is a power you have to learn as opposed to being achievable to all Jedi. Both yoda and Obi Wan has the years between ROTS and ANH/ESB to fine tune and master this power. It is possible that Darth Vader, having seen Obi Wan become one with the force, spent the following years after A New Hope, studying and learning this skill by himself, hence how he was able to appear as a force ghost towards the end of Return of the Jedi, but not quite skilled enough to dissapear on cue.
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