Some references to accusations of "race defilement" when discussing former laws by the Third Reich against
"Aryan" Gentiles engaging in "improper" relationships with Jews, e.g. "Irene Hoffman" character, then 16, in what was seen as an "improper" relationship ("sleeping with" an elderly Jewish male neighbor).
In footage of Holocaust victims show a fully nude dead man. Penis and testicle are shown. While this is not sexual, it is pretty extreme for a 1960's movie.