There is also a scene near the end of the film where the young girl (5?) turns to wave from a boat, exposing the left of her chest as the swimsuit is out of place.
Ulla (Stefanie Stappenbeck,16) is swimming naked in a creek and was spied on by Winfried (Cornelius Schulz, 17?). She got up and covered herself with a towel. At one point it slipped, revealing her nake body again (view is distant).