Professor Filip Mesulam warns Jack Parsons "if you don't proceed with caution, you will fail, or worse, blow yourself up." The real life Jack Parsons died in an explosion in 1952.
Jack is driving in the car listening to The Shadow on a local Mutual Radio Station. Later, he hears Neville Chamberlain giving his Hitler appeasement speech on 30 September, 1938. With this historical timeline the Shadow episode Jack is listening to would be "Dead Men Talk" (Season 3 episode 1/overall episode 79) staring William Johnstone as The Shadow. The episode was broadcast 24 September, 1938. Listening to this episode and comparing it to the one Jack is listening to it seems the producers picked a different episode to use instead of the correct one. "Dead Men Talk" is one of the many so-called preserved episodes and is available for listening to on the internet.