When Private York returns from contemplating his exemption back in Tennessee, the clerk permits York into the major's office with, "All right, Sergeant," rather than, "All right, Private." It is during this encounter that his promotion to the rank of Corporal is approved, so the clerk is not dropping a hint to York.
Alvin York plays with the light switch in the hotel, like he's never seen them before. But since he spent weeks in training in the army and then traveled to Europe and around Europe; electric lights shouldn't have been such an oddity to him
York is called Sgt by officer who receives his captured soldiers and by the French who give him a medal. In New York at the Waldorf, his uniform coat sleeves show a corporal's insignia. Later, in TN, he is wearing a Sergeant's insignia on his uniform sleeve.
At the rifle range, after the first shot, York is given 5 rounds. He shoots the first into the target which is then covered by a white round paster. Then he shoots the next four into the paster. When the target is checked by the range personnel, there are 5 holes in the paster instead of 4.
As General John J. Pershing is shown awarding York the MEDAL OF HONOR, he says that York is being awarded The Congressional Medal of Honor, which is incorrect. As the award citation includes the phrase "in the name of Congress", it is sometimes erroneously called the Congressional Medal of Honor; however, the official name of the medal is, and has always been, MEDAL OF HONOR. As the highest ranking American Army officer of that time, General John J. Pershing would certainly have known that, and would not have made that mistake at the actual award ceremony.
In the movie Sergeant York is presented the French 'Medaille militaire' by Marechal Foch and is shown already wearing the 'Croix de Guerre', however York was not awarded the 'Medaille militaire' by France. He did receive, though, the 'Legion d'honneur' and the 'Croix de Guerre'.
Sgt. York is shown with his pistol shooting a line of German soldiers coming at him from front to back. In reality he shot them in a line from back to front as he quoted himself, "just like a flock of turkeys".
When Gracie is showing Alvin their new home, she claims it was bought for Alvin by the people of Tennessee. It was, in fact, the Rotary Club of Nashville which provided the home and the surrounding land. The home was also not waiting for York upon his return from Europe as portrayed in the film. The club purchased the property in November 1919, a year after the war ended and after York and Gracie were already married. The couple did not move into the house until Valentine's Day 1922.
Alvin York's sidearm in the film was a blank-firing Luger P-08. The real Alvin York carried and used a Colt M1911, but the prop men at Warner Brothers could not figure out how to make this pistol fire blanks without manual cycling of the slide.
When Seargent York looks at the calendar at the end of September to write down his most recent earnings, it is obvious from the calendar close-up that the addition from Sept. 22nd to Sept. 23rd is incorrect. The addition of $41.35 plus $2.55 should yield $43.90, however, the incorrect total of $43.80 is recorded on the calendar as the total for Sept. 23rd.
When Alvin is documenting his earnings in August, 1916, the calendar is off one day. The Calendar for September is correct, but if the two months were viewed together, August 31 and Sept 1st would have both been on a Friday.
When Alvin is teaching Sunday school, he is talking about the story of Cain and Abel, which is in Genesis at the beginning of the Bible and referred to in Hebrews and 1 John, near the end of the Bible, but he has his Bible opened in the middle.
When Alvin steps off the train upon his return to Tennessee, his sister is seen next to the train to his right, fighting toward him through the crowd, but in the next view she is behind Gracie fighting their way toward Alvin from a distance in front of him.