Col. Otley says he is giving Lt. Mallory a "V.O.C.O." so that he can stay at the auto court and not have to report back to base that evening. Most of the wartime audience at the time would have known that stood for "Verbal Order of the Commanding Officer".
Willie Best would later go on to play "Willie" in the eponymous situation comedy series The Stu Erwin Show (1950) in the early 1950s.
The film title is a twist of wordplay on the expression from pillar to post, which by definition according to the Cambridge Dictionary means "If someone goes from pillar to post, they are forced to keep moving from one place to another."
The nightclub performers were the incomparable Louis Armstrong and His Orchestra with the amazing Dorothy Dandridge.