When Elphaba takes Fiyero to her hideout and starts singing "As Long as You're Mine", he unbuttons his shirt. In some shots the shirt is unbuttoned down to his chest, in others it's closed to his neck.
Just before the start of the "For Good" duet, Elphaba has her hair tied in a ponytail; a few shots later, her hair is now loose and flows down the right side of her face.
Fiyero is supposed to have blue eyes, but there are certain parts when Jonathan Baileys real life brown eyes are noticeable.
The gold pin on the Wizard's ascot disappears during Wonderful.
During "The Girl in the Bubble" we constantly hear the sound of Glinda's heels whenever she walks. This appears to be Foley. After she climbed the stairs for the first time, Glinda slows down to look into her closet, yet her footsteps briefly continue walking on in the same tempo as before.