This is approximately 15 minutes into the video. During Jasmine and Aladdin's first attempt at a wedding, she begins walking down the aisle from between two peacocks. At that point, her veil only covers the back part of her head. As she walks and the scene changes, the veil also changes to first cover the top of her head and then change back to only covering the back.
I noticed this the very first time I saw the movie, when I was like 8. I've been wanting to tell people that forever. I think that they just forgot to color it in in that frame.