Swastikas
A couple of the user comments mentioned the scene where the young Jewish boy is drawing swastikas on the wall, his father reprimands him, and the boy says they are good luck. One commentator assumed this had to do with Nazism, while another said no way.
I also wondered about this, since the movie was made in the same year that the Nazis came to power in Germany. It seems almost too much of a coincidence to believe there was no connection. I'm thinking the boy was unaware of the political implications of what he was doing (the swastika is historically a good luck symbol), while the father was quite cognizant of the Nazi connection. Why else was he upset? Certainly a Jewish immigrant would have been aware of the situation in Europe at the time. At any rate, I imagine the point was lost on much of the contemporary audience.
As a side note, if I'm not mistaken, the boy was drawing left-facing swastikas, but the Nazi symbol was right-facing. I'm not attributing any significance to this; I just happened to notice it.