One scene in the movie sees Butler, playing Presley early on in his career, being jeered at by an unimpressed crowd.
In a new interview, Butler discussed singing in the RCA Studio B in Nashville, Tennessee where Presley himself recorded hundreds of tracks.
He told VMAN: “Well, when I was on my first day in the recording studio, Baz wanted me to get as close to performing as possible.
“He had all the executives and everybody from RCA, who were back in the offices, he brought them into the recording studio and he goes, ‘I want you all to sit facing Austin,’ and he told them to heckle me.
“So then they were making fun of me and stuff while I was singing.”
He added: “When we were filming this moment when Elvis first goes on stage and he’s getting heckled by the audience, I knew what that felt like. I went home in tears that night. I really did.”
Austin said that Leonardo DiCaprio had warned him about Luhrmann’s method-style approach to filmmaking.
The actor, who worked with the director on Romeo + Juliet, apparently told him: “Baz is gonna push you in ways you didn’t know somebody could. He’s gonna push you off balance and keep you off balance.”
Elvis is out now in cinemas.