An early draft of the screenplay introduced the following new color-coded emotions: Freedom (white), Love (magenta), Passion (cyan), and Strength (black). Later drafts replaced these with Anxiety (orange), Embarrassment (pink), Ennui (indigo), and Envy (turquoise).
The first trailer received 157 million online views within the first 24 hours, more than any other Disney animated film, surpassing Frozen II (2019), with 116 million views.
"Ennui" is a French loan word that combines the feeling of tiredness and boredom.
The pair of binoculars that Joy and Sadness use is the character Lenny from the Toy Story movies.
Despite being released nine years after the original film, this film is set two years after it.