The 39-year-old actress said she moaned to one of the crew members on set because of the "ridiculous" 12-hour shifts she and her co-star Michael Fassbender had to put in, reported Contactmusic.
"We worked some ridiculous hours. We filmed in the opera house in the centre of San Francisco, which is a functioning opera house, so we'd start at midnight and film until midday. That's pretty gross," she said.
"I remember saying out loud, 'God, I'm so knackered.' And the props woman, who I knew from a couple of other jobs, said, 'Honey, we're here for a lot longer than you are. And I went, 'Oh my God, you're so right'.