Fault in Our Stars: What You Need to Know About the Book and Movie

Green originally considered an altogether different narrator than Hazel. He thought about having Isaac tell the story.

Lest you forget, Ansel Elgort, who plays the Augustus to Woodley's Hazel, played her brother in Divergent.

When asked about what soundtrack he envisioned for a TFIOS movie, Green originally answered that he pictured all Mountain Goats, all the time. They didn't end up on the soundtrack, but I assume he's pretty happy with the lineup.

There are a ton—no, seriously, a ton—of TFIOS-inspired tattoos out there. Click here to have your mind blown.

When Woodley chopped her hair last year to play Hazel, she donated it to a cancer charity.

After shooting emotional scenes, Woodley would go straight home, pop some popcorn, and go to bed.

Prepare yourself for a slightly softer on-screen ending. The screenwriting team behind the film, Scott Neustadter and Michael H. Weber, pointed out to The New York Times that "You can put a book down anytime and take an emotional break, but you can't do that with a movie...the end needed to be a little less bleak."

But do not prepare yourself for a sequel. The Internet is dizzyingly split between NO, A SEQUEL WOULD RUIN EVERYTHING and YES, PLEASE, A SEQUEL polls, rumors and fan fiction. Green, though, just said at a screening: "I'm not gonna write a sequel to The Fault in Our Stars; it would make Fox too happy!"

In fact, Green refuses to answer questions about what happens to Hazel after the book ends—and, more specifically, how long she lives. You can see him shoot down the question a billion times here.

Call it the Gillian Flynn effect: Another one of Green's novels is already headed to the big screen. Fox 2000, the studio behind TFIOS, is now adapting Paper Towns, about a pair of teenage neighbors who discover a suicide victim. Wolff will star.

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