Brie Larson wanted to direct her first feature, and was offered the chance to direct this film after winning the Oscar.
Brie Larson auditioned for the role of Kit, back in 2012, when Miguel Arteta was attached to direct.
Music is provided by Brie Larson's former fiancee and Phantom Planet musician, Alexander Greenwald.
Brie Larson didn't want to play Kit, but Screenwriter Samantha McIntyre insisted that she should play the part.
Brie Larson and Samuel L. Jackson have also appeared together in Farce of the Penguins (2006), Kong: Skull Island (2017), Captain Marvel (2019), and Avengers: Endgame (2019).
The footage showing Kit in her childhood days is taken from actual home videos belonging to Brie Larson's family.
In August 2012, Rebel Wilson joined the cast of the film, with Miguel Arteta originally directing. Mike White and David Bernad were originally going to produce the film under their Rip Cord Production banner.