Continuity mistake: When Elphaba is getting off the boat and walking towards Shitz, we see everyone in front of her part, and she has a clear path directly to the back of Glinda. In the next shot, which is in front of Glinda, people are standing right behind her and part later.
Continuity mistake: During the "One Short Day" sequence, the Wizomania choir arrives featuring Kristin Chenoweth (on the left) singing back to back with Idina Menzel. When Kristin hits the high key, Idina suddenly disappears between instant cuts.
