The Prohibition of Alcohol in the 1920s had a lot of problems, including the general poor public opinions involving it and the creation of organized crime syndicates who profited off selling the new illegal items
Elliot Ness and his men go on a liquor raid during prohibiton. He surprised to learn the alcohol is being stored at a Post Office but his partner informs him of the open nature of alochol smuggling in Chicago during the time.
Double D receives a psychology manual in the mail which describes the latest techniques in studying abnormal human behavior. He shows Ed and Eddy inkblots and asks them to interpret the blots. It is important to note that the Rorschach test is not a new technique; it was created in the 1920's and widely used in the 1960's.