The actor also praised Johnson for the way in which he stepped in to take over writing for Driver's character, Kylo Ren, immediately after his introduction in 2015's The Force Awakens, written by director J.J. Abrams and Lawrence Kasdan.

"Rian is coming into something that we kind of set up and he just took it to the next level in a really great way," Driver said. "He wrote it, too, and Rian’s writing is so clear. I learned a lot of things about my character through his writing. … To understand what J.J. was doing and take ownership from there is kind of a remarkable thing."

As to what kinds of things Driver learned about Kylo during the production of the movie — or whether the audience will learn them too while watching — the actor was suitably tight-lipped. More will undoubtedly be revealed between now and Dec. 15, 2017, when Star Wars: Episode VIII is released.

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