For the set build of the Nazi laboratory in the Poconos, the production design team made the consoles fully operational and controllable. All the buttons and switches worked, and the images on the monitors were tailored to the proposed purpose of each bay.
The plane that hovers above Abendsen's house at the opening scene is a Dornier Do 31 E3. The West German experimental VTOL plane was developed in 1968 to meet NATO specifications but cancelled in 1970 due to technical challenges, high cost, and changing specifications. The Do 31 E3 is preserved at the Deutsches Museum Flugwerft Schleissheim near Munich.
In the alt-history, President Bricker succeeded Franklin D. Roosevelt. This is possibly John W. Bricker who was the Republican nominee for Vice President in 1944.
In the alt-history the Japanese attacked Pearl Harbor in April 1941.
Another law of travel is that travelers are able to move into worlds where they are longed for and where people exist that are objects of their longing.