Winona Ryder has seen a career revival thanks to her starring role on 'Stranger Things', and the star is responsible for keeping the show's music and cultural references in check according to her co-star David Harbour.

The show makes extensive use of a catalogue of 1980s hits, but Ryder strives for accuracy on the set of the show.

“She’d tell them, ‘This song actually came out in ’85, and you have it in ’83,'” Ryder’s co-star David Harbour told Harper’s Bazaar.

"She knew all of these minute, tiny details they didn’t even know, and they had to change things in the script based on that…It’s just kind of epic how wild her mind is and how it goes to all these different corners.”

Ryder gave an interview to Harper's Bazaar about how the show has acted as a comeback for her, and she says she acts as a mentor to the show's young cast.

“I want the kids to understand, this does not happen," she said of starring in a hit show at such a young age.

"This is really unusual, and I’m always telling them, ‘The work is the reward!’ Because when I was that age, it was so hard to enjoy the fruits of my labour."

Co-creator Ross Duffer says that Ryder has been a mentor figure to star Millie Bobbie Brown, and has given her advice about being in the public eye at such a young age.

"Winona has talked to the kids about what celebrity is like and how the press can be and the anxiety and confusion that comes along with celebrity,” Duffer shared.

"I think she’s really helped them. I know she’s specifically helped Millie [Bobby Brown] a lot to work through that, and that’s something that no one else can help with, really, because so few people have experienced it."

"It’s not something I understand. It’s not something that, you know, even a parent would understand," he added.

The latest season of 'Stranger Things' has been a runaway hit for Netflix, with the show ranking second only to 'Squid Game' for the most successful launch for a Netflix show ever in terms of hours watched.

The final part of season 4 hits our screens this Friday, with a bumper-sized final episode running at over 2 and a half hours long.