I have scene it so many times and I remember many scenes.

I love the scene when she is running and her hair is reaching her butt.

Or when she is walking and only her hair covers her naked breasts.

Or when they are swimming towards each other and kissing with hair covering her eyes.

Her hair is varying in length during the movie, but I doubt that it is due to extensions. At least I don't want to beleive that. I hope it is due to varying moisture, or that the filming took several months. I hate extensions, it should be the real thing.