Em uma entrevista com Entertainment Weekly , Escritor / Diretor Rian Johnson declarou:

Em relação a

Snoke: "When I was working on the character of Kylo, I came to a place where I thought the most interesting thing would be to knock the shaky foundation out from under him at the beginning of this movie. By the end of this film, he’s gone from being a wannabe Vader to someone who is standing on his own feet as a complex villain taking the reins." He went on to add, "That made me realize the most interesting thing would be to eliminate that dynamic between the ‘emperor’ and pupil, so that all bets are off going into the next one."

Em relação a

Rey's parents: For me, in that moment, Kylo believes it’s the truth. I don’t think he’s purely playing chess. I think that’s what he saw when they touched fingers and that’s what he believes. And when he tells her that in that moment, she believes it." He also explained why he thought it was more interesting to make Rey nobody than to make her a legacy character's descendant. Johnson said, "The hardest thing for her is to hear she’s not going to get that easy answer. Not only that, but Kylo is going to use the fact that you don’t get that answer to try and weaken you so you have to lean on him. You’re going to have to find the strength to stand on your own two feet and define yourself in this story."

Source