The Mandalorian and Grogu production chilled its Phostera set overnight so actors’ breath would appear on camera during the opening sequence.
Jon Favreau described the trick in a new StarWars.com feature drawn from his director’s commentary. He said the same approach had been used for Tony Stark’s cave scene in Iron Man, giving the air a visible sense of cold.
The film also built an AT-AT interior as a practical stage set. The design team used Star Wars Jedi: Fallen Order as a reference for the first live-action view beyond the walker’s helm.
Those two details were published October 15 as part of a 15-item collection of production notes. They add to the separate behind-the-scenes material Lucasfilm released in September.
Source: StarWars.com.