When Margot Birabeau (Kathryn Grayson) is singing "One Flower in Your Garden" she reaches over to a rose bush and removes a long-stemmed rose with no effort instead of having to cut it free. She then handles the stem without being pricked by the thorns, revealing that the rose is artificial.
When the desert messengers are sending the message with their flutes, the fingering doesn't match the tones being played at all.