I never saw a movie quite like this. As a movie about "The banality of evil", it succeeds, but some things were left unexplained, up to the imagination.
I picked up on several things, but that's probably because I read the Wikipedia synopsis first.
I think that's how I knew the commandant found a human bone in the river his family was bathing in, and why he rushed them out of the water & scrubbed them down - but it was really fast, the camera hardly dwelled on the human bone.
Likewise the grandmother who left in a hurry, no longer able/willing to tolerate what the family was bent on ignoring - it wasn't clear why she left so suddenly. The movie was a bit too subtle.
The animated dream scenes of the Polish girl leaving apples for the prisoners - made me feel, What's going on?
Why was Höss retching at the end? Could he really have a concience?
It would have been made clearer, and maybe a more definitive ending, if the last scene, of the Auschwitz/Birkenau Museum janitors cleaning, was several decades later.