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(Spoiler alert for The Fault in Our Stars movie and book!)

Are you still crying after seeing The Fault in Our Stars?

The adaptation of John Green's best-selling young adult novel stormed theaters this weekend, easily beating the new Tom Cruise action movie Edge of Tomorrow to take the top spot at the box office. The success was in no small part due to the book's ardent fans, who turned out in droves to see cancer-stricken teens Hazel and Gus played by Shailene Woodley and Ansel Elgort on the big screen.

While the movie was an incredibly faithful adaptation of the source material, there were still a few changes from the book.

1. Gus doesn't have an ex-girlfriend or sisters

In probably the biggest change, Gus does not have an ex-girlfriend "no longer suffering from personhood." Caroline, who in the book looked a lot like Hazel and died of a brain tumor that somewhat turned her into a horrible person, is completely absent in the movie. His grown sisters and their husbands and kids also don't turn up.

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2. There's a lot less Isaac

Although Gus' best pal (played by Nat Wolff) gets incredibly important scenes straight out of the book — the trophy scene, the egging scene, his eulogy for Gus and his conversation with Hazel after the funeral — he is a generally less felt presence, and plays fewer video games.

3. No Kaitlyn

Hazel's pre-cancer popular girl best friend doesn't make it into the movie.

4. Gus dies with less suffering

Gus' death is a prolonged and incredibly painful process in the book. The movie still gives him plenty of pain, but it happens more quickly and less graphically.

5. Hazel doesn't have to search for Gus' letter

In the book Hazel discovers that Gus was writing something for her in his final days. After a prolonged mystery and search, she finally realizes he mailed it to Peter Van Houten, who has his assistant e-mail it back to Hazel. In the movie Van Houten simply gives it to Hazel when he shows up for the funeral.

In addition to cleaning up at the box office, The Fault in Our Stars book has spent five consecutive weeks in the top spot on USA TODAY's Best-Selling Books list.

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