During the first assault by the Germans on the church, one of the resistance fighters can be seen firing a Bren gun at the attackers, its distinctive, curved top mounted magazine being clearly visible. In the brief lull after the initial attack has been repulsed, the weapon now has a straight magazine and is in fact a Czech ZB-30 light machine gun, a forerunner of the Bren.
On the moment of the assassination of Heyndrich while the attacker with the Sten tries to fire and the weapon jams the camera turns to Reinhard as he reaches for his handgun. On the background we see the attacker with the homemade hand grenade already attacking. The scene is shown again in the next shot.
In the shootout in the church, dozens of SS soldiers are killed by the Czech resistance members, who have sub-machine guns and a light machine gun. In reality, they were armed with just pistols, and managed to wound five enemy.
The Nazis in the movie use the German Black, Red, and Gold Flags (alongside their Nazi Flags), but in reality, they hated these flags, because they are symbols for the Weimar Republic and the German democracy, both of which they despised.
During the scene depicting the Night Of The Long Knives where the SA were arrested & executed, a member of the SS was seen firing an MP38 or MP40 sub-machine gun.
The Night Of The Long Knives took place in 1934, whereas the MP38 or MP40 wasn't produced until 1938.
Tramways shown in the movie are painted yellow, Prague tramways were and still are painted red.
The scene at around 37 minutes shows troops drumming. They are using what is known as modern "rock sticking" whereas drummers in the 1930s-1940s used "cross sticking" where the drumstick in the left hand is laid across the upturned palm.
By the time Heydrich met Himmler in 1931, Himmler was well past his days a chicken farmer and was living in Munich working to expand the SS. Heydrich also did not earn his job as head of SS intelligence by offering to help Himmler run a farm, but rather by drawing an organizational chart for an intelligence service in less than 10 minutes.
One of the young assassins is injured in the head in one scene - there is a lot of blood streaming from his forehead. After someone treats the wound, in a following scene, the wound has no bandage and looks very deep - but is no longer bleeding.
In the next scene, which seems to take place very shortly after the wound happened, the wound looks very healed with a neat straight scar.
And in addition, in a later scene the remaining scar has gone from being straight to crescent shaped.
The scene in which it is implied a prostitute visits Heydrich as he plays the violin while his wife is at home listening to their son play the piano, there is a close up of her shoes, which are contemporary shoes with stiletto heels, not the kinds of shoes with thick heels women wore in 1942.
At 1:19:20 there was a pot for sugar with the title Cukor. This is a Hungarian word for sugar, but before and after this spot there were Czech sign in the city.
WANNSEE is misspelled in the onscreen title card, which says "WANSEE, JANUARY 20TH, 1942," with only one N.
The film depicts the purge of the Nazi SA (known as the Night of the Long Knives) as a very ad hoc affair with the SS killing SA members in the streets of Germany. In fact, the purge was well orchestrated, SA members having been summoned to a hotel where they were systematically arrested, transported to various prisons and shot by firing squad one to two days later.
During the "Night of the Long Knives" scene an MP40 Machine Pistol is shown. These were not designed until 1938, the purge of the SA was in 1934.
The villa where the Wannsee conference was held looks nothing like the one depicted in the film, nor do the surroundings.
In 1939, Heydrich is wearing his grey wartime uniform with several medals showing front line service with the German Air Force. Heydrich in fact did not earn any of these medals until 1941, after Germany invaded Russia, and then as a Reserve Luftwaffe officer and not as a member of the SS.