Reference is twice made to "Carinhall." Carinhall was Reichsmarschall Hermann Goering's country estate located north of Berlin, where he secreted many of the art treasures he looted during Nazi Germany's reign. It was named for Goering's first wife Carin, who died in 1931, two years before the Nazis took power in Germany. In April 1945, Goering ordered Carinhall destroyed before advancing Soviet forces could capture it. Many of the art treasures left hidden on the estate were subsequently discovered and looted by the Russians.
In 1950, in East Berlin, the communist propaganda services staged a "youth march" to protest the USA's Marshall Plan. They held banners proclaiming, "Yankee, go home". That line has since been used in Central and South America and Japan.
The 'warehouse' where the paintings and other artwork are stored (and where they are moved down into the tunnels) appears to be a redress of the normal Barracks 2 where the gang sleeps. There are no scenes in the barracks area in this episode. The door, windows, and tunnel opening are all in the normal location for the barracks. It even contains a cabinet in the background (to the right of the door, between the cork board and the window) that is normally in Hogan's office/bedroom. Note also that, in the one scene when they are in Hogan's office, the wall, to the right of the door, where the cabinet normally stands, is never shown. In the same way, when the guys go out of the office into the barracks, the camera is placed in such a location that the only thing visible through the door in the barracks proper is the window. Normally, the camera is located to the left of the position used to film this scene. Finally, when the panel covering the tunnel is lifted up, the wall behind the tunnel has vertical stripes on it where the bedposts of the bunk beds were in contact with it (particularly the left one - closer to the window).
The 'Hermann Goering' staff car has license number DDL 357.