The character of Caleb has a very unorthodox style of running in the movie, particularly near the start. This was a choice made by actor Ansel Elgort who stated that, "Shailene Woodley and Theo James are superheroes. Caleb is not. Caleb represents the intellectual side, the guy who isn't physical. And I wanted to make sure that was on screen. I wanted to make sure that made sense."
After cutting her hair for the role of Hazel Grace Lancaster for The Fault in Our Stars (2014), Shailene Woodley decided she did not want to wear a wig for Insurgent. In the book, Tris does cut her hair but not as short as seen in the movie.
Unlike the first film, Insurgent is a very loose adaptation of Veronica Roth's novel, which contains a vastly different plot.
According to Miles Teller, 90% of his scenes he is bleeding from Tris (Shailene Woodley ) beating him up.