You've got a good eye! I didn't catch the skirt color. I did notice she didn't touch down though. I went back and watched it and they are all in black skirts during warm ups, all in blue skirts during the routine and she is in a black skirt after as Eddie walks her out of the building. I am guessing all of that routine footage is from Day 2 then.
Added: I just watched Day 1 on YouTube. (Yes, I'm avoiding doing housework.) I don't see Kelsey touchdown in that routine. I see Angelina touchdown. Anyone else?