Phyllis Smith came out of retirement to reprise her role as Sadness for Inside Out 2. She requested that Pixar find her a recording studio in Missouri, as she had no intention of traveling all the way to Los Angeles just for that.
Anger has a small "swear jar" (with coins in it!) on the shelf next to his bed.
Joy has a clay sculpture of Bing Bong by her bed.
Envy is the only emotion who has only 4 fingers on each hand, while the rest have 5 fingers each.
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).