The original US air date of this episode was April 29, 2009, the 64th anniversary of the liberation of the Dachau concentration camp, on April 29, 1945.
The episode title "Yahrzeit" refers to the Hebrew practice of memorializing a loved one on the anniversary of their death. A yahrzeit candle, similar to the one featured in the final scene, is used in the ceremony.
Many of the actors portraying a Jewish character are in fact Jewish or descend from a Jewish Family.