In the film “Borat” the villagers were not actors; they believed it was a genuine documentary
They were told that it would focus on rural life. After the film was released, they considered suing the Israeli actor Sacha Baron Cohen
"We thought they had come here to help us, not to mock us."
Chris Evans says he memorized the entire end-credits monologue for Deadpool & Wolverine to nail it in one take:
“I don’t get to say dialogue like this. Trust me. I’m going to enjoy every second of this. Memorized.”