In a scene set during World War I, Perry Mason has his typical unshaven face. In reality, U.S. soldiers during the war were held to strict grooming standards that included shaving every day, particularly since the threat of poison gas required gas masks to have a tight seal on the face. Additionally, Mason is referred to as Captain, and officers were especially held to high standards of appearance.
Baggerly notes an association between Masn's blue discharge and "homosexuals and Negroes". While this association would eventually happen it would not be for almost a decade, during the U.S. mobilization of troops for World War II.
At approximately 0:18:45, a pendulum clock is shown on the wall of the office of Elias Birchard. The pendulum on the clock is stationary, indicating that the clock is stopped and thus not keeping time.
When Officer Drake and his wife are talking in their kitchen, the Lee Wiley version of "Oh! Look At Me Now" appears to be playing in the background of the scene. This song was composed and published in 1941 but Wiley's version wasn't recorded until 1951, yet the scene takes place in early 1932.
A telephone operator tells Perry the previous caller was trying the number "SIerra 3-1417." In 1932, Los Angeles telephone exchanges had four numerals, not five. The fifth numeral was not added in L.A. until the late 1940s.
Sister Alice notes that a particular parable comes from the section of the Bible known as the "Beatitudes" and then goes on to liken this to the word "beautiful." These words have different roots. "Beatitudes" comes from the Latin "beata" meaning "happy" or "blessed." Thus the Beatitudes are the blessings or the sayings of happiness; they have nothing to do with the word "beauty," which descends through French from the Latin "bella."