I didn't know it was filmed over three day span. That does explain that. I did notice the error with his shirt and actually it would be the same song where he had one button unbutton and then two buttons unbotton. I don't think I saw him with two buttons unbottom after I Can't Tell You Why.
I have another DVD that was like that. It was filmed from a concert that happen back to back. You would know when the video was taken by how the audience reacting, if they were standing or sitting majority of the time or the confetti on the stage. Even though you would wear the same clothes(I would think they had three different costumes that looked the same because the clothes will be smelling from all the sweat. My favorite group does that too), but it can mess you up. I think its good that a DVD, they would put on there this show was taped from such and such day so the audience who buys the DVD wouldn't think, "Wait. That's not right." Or "he's got on a different shirt on the same song."