Cover illustration is the splash page from the Black Jack story in Zip Comics (Archie, 1940 series) #28.
Mrs. Carter's name is Mrs. Owens on the first page of the story.
It's implied that Clubfoot may actually be real-life Nazi Minister of Propaganda Joseph Goebbels in disguise.
J. Edgar Hoover is not specifically named in this story, but the FBI chief as drawn certainly resembles him.
Marie Antoinette is identifiable by the famous phrase attributed to her: "Let them eat cake."