I have no idea if the ferns were real or not. It reminded me of the first stag film i ever saw which involved a pool boy and the lady of the house and was shot entirely from behind a giant fern. I’ve never truly gotten over that mix of shame and excitement that was created by the voyeristic aspect of hiding behind a big fern while watching forbidden salacious things. While the fully clothed band put a major damper on the salacious aspect, the subject was (or should be) most definitely forbidden.