Continuity mistake: During the fight at the End of the Line Bar, Gem walks and stand next to Castor. Later she move to the left and sits on a couch for the rest of the fight. However, at the very beginning, right after Quorra jumps and protect Sam, there's a brief cut where we can already see her sitting there, too early.
TRON: Legacy (2010)
Ending / spoiler
Directed by: Joseph Kosinski
Starring: Jeff Bridges, Olivia Wilde, Bruce Boxleitner, Garrett Hedlund
Flynn sacrifices himself to destroy Clu. Sam returns to the real world with Quorra in tow. Sam decides to run Encom. He then takes Quorra on his motorbike and shows her the sun.
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More mistakes in TRON: Legacy
Kevin Flynn: The only way to win the game is not to play.
More trivia for TRON: LegacyMore questions & answers from TRON: Legacy
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Answer: Because Clu was given all the authority of the most important user, the creator, Flynn.
Phixius ★
But what did Clu do to Tron to make him serve him? Tron fought for the Users so it would make no sense for him to suddenly side with Clu who wanted to create the perfect system and help him in annihilating the ISO's.
When Clu and co. attacked Tron and Flynn, Flynn's disc must have been damaged, removing his personality in a way similar to amnesia. This allowed Clu, now master of the system, to gain control of Tron's skills. Later, when Prinzler saw Flynn, he remembered him and what he did, and regained his original purpose.
The answer was in the movie itself. During a conversion between Sam and his father it is mentioned that Clu had the ability to repurpose programs. This is the action that allowed him to "build" the perfect system. The isos were manifested without creation from anything and had genuine freedom that Clu couldn't repurpose. This is why he destroyed them because it threatened his strategy to create perfection. Answer: Clu repurposed Tron to serve him and do his bidding. That simple.