Continuity mistake: On the forest moon of Endor when Princess Leia first meets the Ewok, she takes her helmet off and is holding it in her hand (which frightens the Ewok) in the very next shot she is removing it again to show it to him.

Star Wars: Episode VI - Return of the Jedi (1983)
Ending / spoiler
Directed by: Richard Marquand
Starring: Harrison Ford, Frank Oz, James Earl Jones, Mark Hamill, Alec Guinness, Carrie Fisher, Anthony Daniels, Billy Dee Williams, Ian McDiarmid, Kenny Baker, Peter Mayhew, David Prowse
Genres: Action, Adventure, Fantasy, Sci-fi, Star Wars, Thriller
Luke, Han, Leia, and Chewy arrive on Endor, but they are separated during a skirmish with Storm Troopers. Leia encounters Ewoks, small furry creatures who take her to their tree village. Luke, Han, Chewbacca, C3PO, and R2 become ensnared in an Ewok net, and the Ewoks believe C3PO is a god. The group is reunited with Leia, and Luke persuades the Ewoks to help the Rebels. Sensing Vader is aboard the space station and knowing he can sense his presence on Endor, Luke tells Leia he’s endangering the mission and must leave. He reveals to her Darth Vader is his father and that she is also his child. Luke surrenders to Vader who takes him to Emperor Palpatine on the Death Star. The rebel fleet arrives to attack the Death Star, but the protective shield is still operational. Watching helplessly as the battle unfolds, Luke vows never to turn to the dark side. He struggles to submerge his anger and hate but is goaded by Palpatine to surrender to his emotions and attack him with his light saber. Luke attempts to strike, but Vader intervenes and they duel. Vader hears Luke’s thoughts that Leia is his sister and now he intends to turn her to the dark side. To protect Leia, Luke furiously attacks Vader. He has become powerful and after an intense battle, defeats Vader. Palpatine urges Luke to kill Vader and assume his position, but Luke refuses and tosses aside his light saber. Accepting that Luke can never be turned, the emperor showers him with electrical bolts. As Luke writhes in agony, Vader picks up Palpatine and throws him to his death down a deep reactor shaft. Vader is mortally wounded. Aided by Ewoks, Han and Leia destroy the shield generator. The Rebel fleet attacks the Death Star, delivering it a lethal blow. With destruction imminent, Luke drags the dying Vader to a small ship. Near death, Vader asks Luke to remove his mask so he can look upon his son with his own eyes and then dies. Luke escapes moments before the space station explodes. With Palpatine and Vader dead, the Empire collapses and the Republic is restored. During celebrations on Endor, the ghostly specters of Obi Wan, Yoda, and the youthful Anakin (Vader) appear to Luke. Redeemed and fulfilling his destiny to return balance to the Force, Anakin is a Jedi once again.
Edmund
Darth Vader: Obi-Wan once thought as you do. You don't know the power of the dark side.
Trivia: When they were filming the scenes on Endor, Peter Mayhew was told to stay close to the set so no one would mistake him for Big Foot and attempt to shoot him.
Question: After Anakin becomes Darth Vader, he seems ruthless, actually evil. "From my point of view, the Jedi are evil!" Is just one quote. That being the case, this movie makes it seem like Anakin knows that he's evil and wishes he wasn't. Basically, my question is, why didn't Anakin turn on Palpatine sooner? Or simply leave the Sith?
Answer: Anakin was seduced by the emperor to think that the Jedi were evil. This was partly fueled by anger &fear, thinking Padme would die if Palpatine didn't help save her. After he turned to Darth Vader & joined the dark side, he eventually realised the true nature of the Emperor, but he was to weak to do anything about it. Darth Vader still wanted to rule the galaxy, but didn't want the emperor controlling everything. He just wanted to use Luke to help overthrow the emperor and take over the galaxy. It wasn't until he found out he had a daughter also, and saw Luke about to die by the hands of the emperor, that he realised that Luke was right & he needed to switch sides.
Vader was not just using Luke to kill the Emperor. He actually did want to rule the galaxy as father and son - if Luke would turn to the Dark Side, that is.
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Answer: Darth: "Obi-Wan once thought as you do. You don't know the power of the dark side. I must obey my master." It's implied that the dark side is intoxicating, once you totally give in to the dark side it has a hold on you, and appeals to morality and rationalization are useless against your lust for its power. (On a symbolic level, the dark side is a metaphor for vice. Darth Vader is an addict and abusive parent. It's actually funny how many scenes still make sense if you replace "the dark side" with "the bottle" or similar).
TonyPH
If we bring the prequels into it, it's one of the criticisms of those films that they only make the question of how much Anakin is a "true believer" more confusing. But it stands to reason that at first Anakin may feel vindicated in his resentment toward the Jedi. Later on, Vader may not feel that as strongly, but by then his anger has turned toward himself for failing to save Padme. He may feel that a man as terrible as he does not deserve to be "rescued" from the dark side, leading to a feedback loop where he only gets further enamored with its power and does more evil things which causes him to hate himself even more, and so it goes.
TonyPH