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.
Shailene Woodley insisted that her friend Ansel Elgort read the script and the novel before his first meeting with the filmmakers. "I thought, 'If I tell her I haven't read it, she'll be mad during our audition, and it would be a mess,'" Elgort recalls. "So I read it for Shailene."
John Green: the father of the blonde girl talking to Shailene Woodley's character at the airport before the departure to Amsterdam.