Michelle Pfeiffer says there was 'no bathroom' and 'no food' on 'The Madison' set

"You may as well be in a tent because, you know, there is no bathroom," Pfeiffer said of filming scenes in the open terrain. "Even the outhouse is not real. So there's no AC, there's no plumbing, there isn't anything. But it is breakthtakingly glorious."

"It took a while [to get used to] because they built that cabin. It was all a little bit rushed for everyone and so there weren't certain accommodations set up," she later said. "We didn't really have a trailers there because they were shooting 360 [degrees]. So, they couldn't have a bunch of trailers around."

"There was really no place for us to sit," she continued. "There was no bathroom nearby. There was no food. And in the winter, it was cold. It was like, 'Could we have a heater?' And in the summer, it was like, 'Could I get an umbrella because the sun's really intense?' It took us about halfway through to figure all of that out."

Pfeiffer said she consulted Mirren because she had to "know something concrete about this guy, this project."

"And she just glowed; she couldn't say enough nice things," Pfeiffer recalled of Mirren. "She said the scripts were great, the productions were perfect. She was having the time of her life; she loved Montana. So I took a big leap of faith, and I committed. I thought, 'Well, the guy has a pretty darn good track record.'"

Fox News Digital's Ashley Hume contributed to this post.