Revealing mistake: Tanner Boatwright was used as a leg double for Augustus. In the part of the sex scene where they shoot from the feet up, you can see that the amputated thigh is thinner and has a slightly different colored tone of leg hair than Ansel's actual leg. (01:05:25)

The Fault in Our Stars (2014)
1 revealing mistake - chronological order
Directed by: Josh Boone
Starring: Laura Dern, Shailene Woodley, Ansel Elgort, Nat Wolff
Other mistake: In the book Hazel is reading near the start of the film, the word 'to' is used 4 times in a row.
Hazel: Even though you have freaking cancer, you are willing to give money to corporation for a chance to acquire even more cancer? Let me just assure you that not being able to breathe SUCKS. Totally disappointing. Totally.
Augustus: They don't kill you unless you light them. And I've never lit one. It's a metaphor, see: You put the killing thing right between your teeth, but you don't give it the power to do its killing. A metaphor.
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