The curling iron couldn't have made its way to the back of Ms. Osnes' head...? Ya know since you're shooting her from behind for a portion of the commercial?
I don't think it's on the recordings, but Maggie sings a G#5 in A CHORUS LINE during the Montage on "life is an ashtray" after the "never get to wear nice clothes" part. You can hear, again, Mara Davi do it flawlessly on *that site*