Aaron Paul mentions Hugh in interview with Variety

Paul: Does he have his lines memorized?

Hiddleston: Hugh Laurie is the most diligent, most serious, most professional actor you could possibly work with. Woe betide the actor who is not ready to work with Hugh. He’s a true pro. Hugh has his lines memorized, sometimes lines that he’s written himself.

Paul: That’s like Hugh (Dancy) on “The Path.” I’ve never seen him with the set of sides. Which, for me, I mean I come prepared, but it’s nice to have that as a security blanket.

Hiddleston: Sure.

Paul: But I look at Hugh… I really look up to him. I mean, he’s such a phenomenal actor, but he’s never once looked at a page of sides.

Hiddleston: It’s interesting. I always find there are some actors who come with the script completely internalized and never have to look at it, and they come very ready with ideas to pitch about staging. And other actors who are more fluid. And there’s no one way that’s better. I think some people like to feel their way through it and be spontaneous, and other people like to have thought about it before.

Paul: Right. This is a big difference that I see with TV and film. Film, the script tends to, at least in my experience, tends to somewhat stay the same, in terms of the dialogue and the story. And with TV, I’m getting pages the night before, with the scenes being completely changed. I like having my little security blanket.