In the first 10 minutes when the boy Ravenfeather (Vaclav Tvaroh, 9) only wears a loose loincloth. It fails to cover anything when he's struggling or carried by someone, front and rear briefly seen a few times.
Honza (Jan Morávek, 11 or his twin brother Martin Morávek) and his friends are watching nude women in the bath house and have to run away naked: brief frontal nudity. Nude girl (8?) opens them a door.