Cricket sings "But Not for Me," written by George and Ira Gershwin for the 1930 musical Girl Crazy.
The previous season, Yuki Shimoda guest-starred on "Second Day of Infamy," which also dealt with a Japanese soldier who did not know the war was over. In both episodes, he played the soldier in question, though they were not the same character.
This was the first of six consecutive episodes in which Conrad does not appear. No explanation for his absence has been verified, though given his combative nature, he may have been on suspension, as Connie Stevens was later on, or simply walked off, as Edd Byrnes had done on "77 Sunset Strip." (It's well-known that Warner Bros. paid its TV actors far below their worth.)