At the end of the movie a graphic states that 99 people were tried and sentenced at Nuremberg and that by the date of the movie (1961) none remained in prison. Some critics have pointed out that Nuremberg defendants Rudolf Hess and others were still imprisoned in Spandau. However, Hess and the other major defendants were tried by the International Military Tribunal (with judges and prosecutors from each of the four victorious Allied powers). The caption in the film states that the statistic refers only to the Nuremberg trials "held in the American sector." By 1961, all of the defendants sentenced in the American trials were indeed free; the graphic is therefore correct.
When William Shatner's character (Capt. Byers) swears in Montgomery Clift, the Clift character (Peterson) fails to use the headphones, yet answers the question as if he understood the oath. There was no indication that Byers spoke German nor that Peterson, who was feeble minded, spoke English.
When the defense lawyer Hans Rolfe (Maximilian Schell) is questioning a witness, he first asks if they had sworn to "The Civil Servant Loyalty Oath of 1934". However, then the prosecutor's assistant is asked to read the oath from "The Reich's Law Gazette, March 1933".
Right after Rolfe completes the quotation from Oliver Wendell Holmes regarding sterilization, we see Haywood with his hand on his mouth. The wider shot that follows shows him with his hand on his cheek.
Right after Richard Widmark states that "the defense rests", he sits down next to his assistant attorney. A moment later the assistant's arms have changed position and Widmark's hands have changed position.
The housekeeper, Mrs. Halbestadt, says that Mrs. Bertholt's husband was executed in connection with the Malmedy massacre during the Battle of the Bulge. Although many Germans were found guilty for the massacre and some were sentenced to death, none of them was ever actually executed.
At the night club, when the reporter Max Perkins tells Judge Haywood that he couldn't give a story away on the trials because the American people aren't interested, Haywood remarks, "But the war's only been over for two years," to which Perkins replies, "That's right." The film's opening title card says "Nuremberg 1948" - three years after the end of World War II. The actual Judges Trial, upon which this film is based, was held in 1947. It is likely that the title card is incorrect.
None of the American officers have shoulder patches on their coats. As a minimum, they all should be wearing the insignia of their current organization on their left sleeve. In addition, officers with World War II service should have the patch of their previous unit on their right sleeve.
When the defendants are shown entering the courtroom, they are seen entering from another, brightly lit, nondescript room. When the last has entered the courtroom, the MP closes the door between them. The real courtroom had an elevator, with a sliding door, which brought defendants to the courtroom from the basement.
In an outdoor scene, several US Army MPs are shown in the background standing at parade rest with rifles. Instead of being armed with the standard issued rifle of the day, US M-1 Garands, the guards are holding British Lee-Enfields, which were used in WWI and WWII by the British Army.
When showing the concentration camp films, Colonel Lawson is standing in front of the screen. His shadow should be cast on the screen due to the projector's light, yet it's not visible. This suggests that the films were actually a rear projection.
The American judges and German defendants speak through an interpreter. At first, there is a substantial delay in the dialogue while the translation takes place but eventually the reactions becomes nearly instantaneous (for example, when the judge says "You may be seated", the defendants sit down right away without waiting for translation). The translation delays were likely dropped to keep the movie from dragging.