Zooming in on Michael Kitchen’s face is always a good idea.
In the S9 DVD featurette The Truth Behind the Fiction: High Castle, Anthony Horowitz said of this scene:
I wanted to see Foyle in front of a concentration camp. That was the single thought that sparked off the very first episode. It occurred to me that if Foyle was the epitome of good and decency in the period 1940 through to ’46, ’47, then it would be quite interesting to juxtapose him against the symbol of all evil.