When The Henrys board the "Bremen" in New York in their first scene, an onscreen caption shows the date as April 20, 1939. A few scenes later, the captain announces at dinner that it is the final night of the crossing. The "Bremen" took 5 days to cross the Atlantic, so that would make it April 24. However, he then leads the passengers in a celebratory toast for Hitler's Birthday, which he specifically says is that day. Hitler's birthday was April 20th, not April 24th. Herman Wouk's script called for a caption saying the New York scene was on April 15, which would have put the party accurately on April 20, but the actual caption used in the finished episode mistakenly says April 20.
In the first episode, general Walter Von Brauchitsch is seen wearing shoulder boards with the crossed batons of a field-marshal. Von Brauchitsch was promoted to field-marshal on 19th July 1940 along with 11 of his colleagues for the defeat of the French army. The first episode is supposedly set in March-April 1939.
Armin von Roon, played by Jeremy Kemp, is listed in the title credits with the title "Brigadier General." This is wrong on two counts. The German Army during this period never had this rank (colonels advanced directly to major general.) Additionally, the first time von Roon is seen in uniform (aboard ship) he wears the insignia of a major general. By April 1939 he wears the shoulder boards of a lieutenant general, although the pip is off center.
When Pug and Rhoda leave for Berlin on the "Bremen", stock footage is used of a ship sailing out of New York harbor. It is postwar footage of the French Line's "Liberte." Although she was once the "Europa," the sister ship of the "Bremen," in this postwar footage her funnels are painted red and black, instead of the yellow of the "Bremen." The next time we see the ship at sea it is stock footage again, but this time it is another ship entirely, the Italian Line's "Conte di Savoia," with white funnels with red and green stripes.
When Hitler addressed the Raichstag saying he would not remove his uniform until the war was over, he was wearing a dusky blue jacket. Hitler's jacket was brown.
When Pug and Rhoda go looking for a house to rent in Berlin, it's still early spring. However, the establishing shot of the house they find shows fallen leaves on the streets and coloured leaves in the trees, clearly showing that it was filmed in the autumn.
Armin von Roon, played by Jeremy Kemp, is listed in the title credits with the title "Brigadier General." This is wrong on two counts. The German Army during this period never had this rank (colonels advanced directly to major general.) Additionally, the first time von Roon is seen in uniform (aboard ship) he wears the insignia of a major general. By April 1939 he wears the shoulder boards of a lieutenant general, although the pip is off center.
When Alistair Tudsbury is picked up by Pamela after attending Hitler's speech at 2:11:06 - and the car is seen against the opposite buildings - the roofs are full of TV aerials.
The aircraft landing in Warsaw, summer 1939, carrying Natalie Jastrow and Bryan Henry is an Antonov AN-2 which was not produced until 1947 by the Soviet Union.
There is a scene set in 1939 at "LaGuardia Airport" with a large sign in the background with this name. However, the airport was not given this name until 1953 and in 1939 it was called the "New York Municipal Airport."
When Natalie enters Byron's room, a shadow of the boom mic is visible on the far wall.
In the first episode, the rank of Walter von Brauchitsch is incorrectly given as Field Marshal, he also carries Field Marshal's batons on his epaulets. The episode is set shortly before the invasion of Poland on 1st September 1939. His rank on that date was Colonel-General (Generaloberst). He was promoted to Field Marshal (Generalfeldmarschall) on 19th July 1940 along with 11 other generals as a reward for the Fall of France.
Hermann Göring is shown in multiple scenes wearing the uniform, insignia, and carrying the baton of a "Reichsmarschall". All of these scenes are set in 1939; Göring was not appointed to the rank of Reichsmarschall until the summer of 1940, after the fall of France.