‘Wicked’ Director Jon M. Chu on Those Surprise Cameos: “We Had One Day to Do It”

Image from The Hollywood Reporter

• Chenoweth and Menzel, the original Glinda and Elphaba, made a special one-night-only appearance in the film's 'One Short Day' sequence, with just 12 hours to shoot their scene, and it was an emotional experience for the entire cast.
• The cameos also featured writer Winnie Holzman as an Emerald City resident and composer Stephen Schwartz announcing 'The Wizard will see you now', adding an extra layer of authenticity for fans.