At c.6 minutes Dr Braun and his daughter suddenly switch seats on the train.
During the final scenes of the North Dakota town (c.55 minutes) there are taller, modern buildings in the background.
The US Department Of Agriculture Soil Conservation Officer tells John Phillips (John Wayne) that the Government considers the soil in his small, North Dakota town "doomed". The Officer shows John the entire "doomed" area, which is highlighted on his map of the United States. The northern part of the highlighted area starts around the same latitude as Chicago. This areas is probably at least 400 miles south of the North Dakota's southern border.
Doctor Braun's "Austrian" accent briefly reverts to a distinct Irish brogue at around 29 minutes.