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In Divergent (2014), Shailene Woodley and Ansel Elgort play brother and sister, while in this movie, they play boyfriend and girlfriend who have sex.
The title is a variation on a quote from Act I, Scene II of William Shakespeare's Julius Caesar: Cassius says "The fault, dear Brutus, is not in our stars, but in ourselves..."
Author John Green based the character Hazel on a young girl named Esther Earl who was diagnosed with thyroid cancer. Green met her during a Harry Potter convention in 2009 noticing her carrying an oxygen tank. He came to like her because of some of the videos she put up on YouTube as well as her humor and openness. From the time they met to her death at the age of 16 in 2010, Green and Earl would exchange correspondence.
A replica of the interiors of the Anne Frank house had to be built as the movie was denied permission to film inside the actual house.
Green added via Twitter about Shailene Woodley's audition for the role of Hazel, "There were so many amazing auditions for the role of
Hazel, but Shailene's love for the book and
her understanding of Hazel blew me
away."
John Green: the father of the blonde girl talking to Shailene Woodley's character at the airport before the departure to Amsterdam.