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Kendall Jenner was invited personally to appear in the star-studded video but couldn't do it because she had an out-of-town commitment on shoot day.
Each actor/actress chose their character's name and persona.
Haley Williams stated that her character was based on the character Leelo (Milla Jovovich) from the movie The Fifth Element.
Two leads are Selena Gomez and Taylor Swift. Selena chose her name, Arsyn. Taylor's character (Catastrophe) is named after her love for Cats.
Ellen Pompeo daughter's name is Stella Luna. Ellen Pompeo character's name is Luna.
There are 19 actors in total.