🚨 There are MASSIVE spoilers ahead for Dune, Dune: Part Two, and Frank Herbert's Dune. 🚨
1. First, in Dune: Part Two, Chani can be seen using a piece of blue fabric as a headband, notably in the scene when Paul rides the sandworm for the first time. In the book, The Art and Soul of Dune: Part Two, director and writer Denis Villeneuve explained that "when Fremen women fall in love, they wear blue in the film."

2. In Dune, when Paul meets Reverend Mother Mohiam she uses the voice on him to declare that he should be silent when he has his hand in the box. In Dune: Part Two, there's a great parallel where Paul now does this exact thing to her before he fights Feyd-Rautha.
