They never rinse the developed prints in water witch means that they are chemically unstable and will bleach rather fast in daylight.
Ricken and Ziereis are wearing the wrong rank insignia.
Ziereis addresses Ricken as "Oberscharführer" (Staff Sergeant), but he wears the rank insignia (shoulder and collar) of an Untersturmführer (2nd Lieutenant).
Ziereis is being addressed as an Hauptsturmführer (Captain) but he wears the rank insignia (shoulder and collar) of an Obersturmführer (First Lieutenant)
Ziereis addresses Ricken as "Oberscharführer" (Staff Sergeant), but he wears the rank insignia (shoulder and collar) of an Untersturmführer (2nd Lieutenant).
Ziereis is being addressed as an Hauptsturmführer (Captain) but he wears the rank insignia (shoulder and collar) of an Obersturmführer (First Lieutenant)
Ricken and Ziereis are wearing the wrong rank insignia when Ricken says that Ziereis' methods are drastic.
Ziereis addresses Ricken as "Oberscharführer" (Staff Sergeant), but he wears the rank insignia (shoulder and collar) of an Untersturmführer (2nd Lieutenant).
Ziereis is being addressed as an Hauptsturmführer (Captain) but he wears the rank insignia (shoulder and collar) of an Obersturmführer (First Lieutenant)
Ziereis addresses Ricken as "Oberscharführer" (Staff Sergeant), but he wears the rank insignia (shoulder and collar) of an Untersturmführer (2nd Lieutenant).
Ziereis is being addressed as an Hauptsturmführer (Captain) but he wears the rank insignia (shoulder and collar) of an Obersturmführer (First Lieutenant)
The VW Käfer is from the 60s, way after the end of the war.
There is a Volkswagen Beetle car painted black used by the Nazis. The model shown in the movie has a wide rear window which was not introduced to this car until the late 1950s. Also, it would not be entirely correct to use this car as used in the movie because the initial production from 1941 to 1945 consisted of only a handful of units.
A perfect example how once solidified cliches tend to multiply themselves. The Graflex reporter camera was used by American photojournalists in the 1930-1950s and they became iconic in Hollywood movies. But why should they be used in Germany, the country leading the photographic industry worldwide for almost a century before and another 20 years after WWII? They produced and used their own gear that was nr. 1 in quality and had not why to use the crude Graflex. Besides, the specific Graflex model used in this movie is one produced after the war.
One of the enlargers shown in the darkroom is a Leitz Focomat 1C. This enlarger was manufactured from 1950 through 1977 so it is impossible that it was used at the time of the movie.
The negatives shown at the end of the movie are Kodak TX 400. The photographic material used by the Germans at this time was from Agfa, in now way from Kodak.