13 surprising things you didn't know about 'You'

• Scenes in Mooney's bookstore in the thriller series "You" are filmed in an actual book store in New York City.
• Peach Salinger's name is meant to sound annoying, according to the author of the book the series is based on.
• Certain "You" filming locations, like the Greenpoint Avenue subway station and the Staten Island Ferry, are fictionalized versions of real locations.

Warning: Spoilers ahead for "You."

By now, you've likely heard about — or watched, or become wholly obsessed with — "You," a thrilling Lifetime-turned-Netflix series featuring Penn Badgley, Elizabeth Lail of "Once Upon a Time,"Shay Mitchell, and John Stamos.

The show centers on a bookstore manager, Joe Goldberg (Badgley), who meets a woman named Guinevere Beck (Lail) in his shop. Joe develops an obsession with Beck and begins to stalk her in full force. He memorizes her schedule, sneaks into her apartment, and kidnaps her on-again, off-again, aspiring-artisanal-soda-creator boyfriend.

And that's just the first episode. With a premise like that, you know "You" has to have some fun behind-the-scenes facts.

Here are some surprising things you might not have known about "You."

The book's author has written for some shows you've probably watched.

The show is based on a book of the same name by Caroline Kepnes. "You" was Kepnes' first book, but according to her website, she's written for shows including "7th Heaven" and "The Secret Life of the American Teenager." Kepnes also wrote "You Got Me Babe," the eighth episode of "You."

Penn Badgley didn't want to play Joe at first.

At first, Badgley was reluctant to take on the role of Joe. In an interview with Entertainment Weekly, he said he was "conflicted" about the part, largely because the show is framed as a love story. "If this is a love story, what is it saying?" he said.

Ultimately, discussions with showrunners Sera Gamble and Greg Berlanti convinced Badgley the part and show had enough nuance to make it worth taking.

Read more: 10 things you probably didn't know about Penn Badgley

The facade of the bookstore where Joe works is a real store.

"You" used Logos Bookstore, a specialty bookstore on the Upper East Side of Manhattan, New York, as the exterior and front interior of Mooney's, according to Brick Underground. Although little was changed about the actual bookstore, Logos does not have a cage in its basement. The basement scenes in "You" were filmed on a separate set in the Bronx.