Trivia: Anthony Daniels once again portrays C-3PO, making him the only actor to appear in every Star Wars film to this point. He also plays C-3PO for a brief cameo in Rogue One.
Trivia: Finn and Rose's mission on Canto Bight is interrupted by the fact that they parked their ship illegally. This also happens to the heroes in the Star Wars parody film Spaceballs by Mel Brooks that came out in 1987.
Trivia: Rian Johnson wrote TLJ without knowing how TFA was going to end or how the trilogy would be concluded in Episode 9.
Trivia: The Porgs on Luke's island only exist because the real island is the habitat of puffins, and filming couldn't interfere with them. It proved more appealing and frankly simpler to digitally alter the appearance of the puffins, rather than erasing them entirely.
Trivia: Benicio Del Toro's character, DJ, is never referred to by that name in the film.
Trivia: First Star Wars film in which none of the main characters say "I've got a bad feeling about this." Although Rian Johnson has confirmed that the line is beeped by BB-8 early in the movie, after which Poe Dameron tells him not to be so worried about their current mission.
Trivia: Mark Hamill's three children have cameos as Resistance fighters.
Trivia: During filming of the scene where the Jedi Temple is burned down, Mark Hamill broke down crying. The tears you see are real.
Trivia: Luke Skywalker actor Mark Hamill stated in some interviews that wasn't sure about the film's treatment of his character at the start of production, but he still stuck with the script out of respect for director Rian Johnson's vision. When news of this was revealed, many misconstrued his comments and concluded that Hamill disliked the film. On the contrary, Hamill later clarified that despite his initial hesitance, he thought the finished film was quite good and a worthy addition to the series.
Trivia: The name of the bird creatures on Luke's island ("Porgs") is never mentioned in the film. Much like the Ewoks in Return of the Jedi.
Trivia: The gloved hand that grabs Han Solo's dice at the end of the movie belongs to director Rian Johnson. (Source: Film School Rejects).
Trivia: When Kylo swings his lightsaber towards Luke during their fight on Crait, the "Wilhelm scream" can be heard.
Trivia: This is the first Star Wars film featuring Chewbacca not to have actor Peter Mayhew playing the part. He retired after The Force Awakens.
Trivia: This is the first "Star Wars" film in which Kenny Baker was not involved with the portrayal of R2-D2. Jimmy Vee was given the role before Baker's death in August 2016.
Answer: He knew that his blue lightsaber still existed because Rey brought it to him. He chose to show the blue lightsaber because it belonged to Anakin and Kylo Ren was obsessed with it. He knew that Kylo Ren would be angry at Luke wielding a lightsaber that looked like Anakin's and that rage would help keep him distracted. Here is a quote from Rian Johnson regarding this: "He knows that Kylo's Achilles heel is his rage, and so that's why he kind of makes himself look younger, the way Kylo would've last seen him in their confrontation at the temple, and that's why he decided to bring Kylo's grandfather's lightsaber down there - the lightsaber that Kylo screamed at Rey, 'that's mine, that belongs to me.'"