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They made a movie, , and worked on M. Night Shyamalan’s Wayward Pines before writing a script , "What if Steven Spielberg directed a Stephen King book?"

It took place on Long Island in 1980, but the Duffers had to change the show's location when they realized it would be to shoot there in winter.

The alleged government experiment took place in the early '80s and involved kidnapping kids from Long Island to experiment on them. You can read all about it .

And read parts from Stand By Me in the audition.

He the titles for films including Alien, Superman and The Goonies.

But they got so used to calling it the "Upside Down" on set, it stuck, Millie Bobby Brown . The same thing happened with the Shadow Monster in Season 2; it's supposed to be called the Mind Flayer.

"When you see someone like Gaten, and he pops the way he does, you’re just like, 'This kid, we’re putting him in the show, 100 percent,'" Matt told .

Long before the Duffers cast her as Eleven, King his love for Brown on the British show Intruders: “Millie Brown, the girl in Intruders, is terrific. Is it my imagination, or are child actors a lot better than they used to be?”

“We actually talked very little about the show or the character of Joyce; we were mostly just getting to know each other,” the Duffers told . Ryder joined the project the next day.

Ellen Burstyn in Alice Doesn’t Live Here Anymore and Marsha Mason in Max Dugan Returns and Audrey Rose Winona Ryder's performance.

"Sometimes our kids have great ideas, and this is one of those times!" the Duffers told .

"A lot of credit goes to Joe Keery because he was much more likable and charming than we originally had envisioned," Ross Duffer told .

Dr. Brenner was particularly hard for the Duffers to write because you see the character so little on the show. "He informed it, and I’m really happy with where we wound up with him at the end, with something that was discovered during the course of shooting," Matt Duffer told .

“Matt and Ross were like, ‘Basically you’re going to be an alien,'" she told .

"We took Noah’s mom aside, told her we had something to show her, and led her into a dark closet where we had propped up this frighteningly realistic corpse of her son," they . "She was startled at first, and we felt like maybe we crossed a line… But after the initial shock, she loved it."

It held up production for a half hour, the Duffer Brothers .

...to in the kiddie pool.

"I was thinking, this is the biggest thing I've ever done and how cool would it be if I actually got this? And I did!" she tells .

And it scared the little kids on set, including the twins who played Holly Wheeler and Millie Bobby Brown's little sister. Someone told the kids the monster came from Monstropolis in Monsters, Inc. to calm them down, the Duffers wrote in .

“They had a life of their own, moving in unpredictable and bizarre patterns,” the Duffers told .

The Duffers heard their music when it was used in the film The Guest, they told , and convinced Stein and Dixon to quit their day jobs to work on the show full time.

And 361,000 people all nine episodes in its first 24 hours.

In 1984, everyone Californians sounded like Sean Penn in Fast Times at Ridgemont High.

She called it one of the hardest scenes she's ever filmed .

He also wore a G-string. "I was thinking: Either I'm never going to work again, or somebody somewhere is going to see one thing in me, and they'll give me a chance," he told . The Duffers loved it." I’ve watched thousands of auditions now, and it’s by far the most bonkers that I’ve witnessed," Ross told .

"I felt at one point I couldn’t do it [anymore], but then I got this and everything changed,” she told .

But Matt Duffer , “Bob definitely does not read Stephen King… he hates that kind of story.“

“There was this one that I was worried about. So I just texted her, ‘Hey, can you help me with this? Can you come in and talk to me about it?’ And she came in like an hour and a half earlier than she was called in for and she brought me in her trailer and she talked to me," Schnapp told . "She gave me tips and guided me how to do the scene. And she was like, ‘You’ll do it. You’ll do great.’”

It's his Chewbacca impression.

“It’s kind of expensive, so thank God it was only for that one short sequence," Matt told . "We wouldn’t have been able to do that the whole season."

Matt a "really intense day of shooting."

“There’s a Tom Cruise poster in Nancy’s room,” Matt told . “Apparently, Tom Cruise is just [like], “If you want to use that poster, you can use it for free.” He just loves that picture of himself, I guess. There were no problems getting rights to that.

“[Priah Ferguson] was just a local hire we made in Atlanta," Matt told . "Erica wasn’t even supposed to be in [Season 2] as much as she was. We fell in love with this girl... I thought she’s very GIF-able, if that’s a word."

They were very nervous about the phone call. "His tone was very serious. He seemed very skeptical, and he was like, 'Can you explain why you want to use Ghostbusters in this?' Matt remembers "We had this very nervous speech about what Ghostbusters meant to us... He made us go through the exercise, but he’d already decided to let us do it. He was like, 'We’re very flattered by it. Of course we’d love to have you use it.'”

“When we first pitched the season there was no Dustin and Steve bromance,” Ross . “These are two characters that are both a little heartbroken, so we thought that they could help heal each other.”

And Sadie Sink was grossed out .

She told , "At one point, they told me, ‘Oh, we think you’re too tall. I don’t know if we should let you read for it again because you’re too tall.'" The team behind the show worried she would tower over the boys, but luckily, they grew to match her height.

Ross Duffer they originally planned to kill Bob around Episode 4, but they liked Sean Astin so much, they kept him alive until Episode 8.

The Mind Flayer would've killed Bob through Will, the Duffers revealed on Beyond Stranger Things.

Stranger Things 2 had a much bigger visual effects team than Season 1, the Duffers .

In the Stranger Things 2 after show, Beyond Stranger Things, Ross Duffer , “We were not going to make it as memorable as we did, and then he kept talking about Jaws and Quint being ripped apart, and I was like, all right man, we’ll do it."

But according to a , they prefer to play board games and cards on set rather than bring their phones.

He said as much in . Don't we all, though?

And WB .

But the Duffers and their executive producers .