(at around 10 mins) When Abraham is thrown on the ground during his first vampire fight, he receives numerous scratches on his chest, his clothes are torn in pieces and covered in his own blood. When he wakes up in the bed there is not even a single wound or mark on his chest.
(at around 2 mins) When the young slave gets whipped by the slave owner in the beginning of the movie, the location of the scar below his left eye changes between scenes.
(at around 1h 35 mins) During the Gettysburg Address, Lincoln's hat and gloves are shown being pushed off the back of the table by the wind as the camera pans around, but return when it cuts to the front shot where he picks them up off the table.
(at around 1h 4 mins) When President Lincoln calls his son Willie over for a kiss, Will Johnson calls Willie over for a kiss and after Willie leaves the office Will's glasses are on his face, then disappear and reappear.
(at around 16 mins) When Henry is teaching Lincoln to chop harder, Abe's first few chop marks disappear in following shots.
(at around 1h 21 mins) On the train Will Johnson is seen loading a cap and ball style revolver by inserting a ball into the rear of the cylinder. The cylinder would actually have been loaded from the front, each chamber like a small musket, with powder first and then a ball.
(at around 1h 12 mins) During the first battle scene set at Gettysburg, Captain Slash runs his Union unit through the process for the whole unit to fire a volley at the charging Confederates, but when he actually issues the command to fire, the men fire at will, or individually, instead of firing together at once.
(at around 32 mins) Lincoln's stove pipe hat supports the full weight of Mary Todd. Any hat of this sort would easily collapse under the slightest weight of anyone's foot.
It appears that all of the artillery pieces shown in the film's American Civil War scenes are howitzers, which were actually quite rare on the battlefield; these should have been more conventional cannon, with longer and thicker barrels.
(at around 1h 30 mins) Mary Todd Lincoln grabs and uses a Spencer 1860 repeating carbine at Gettysburg; however, Spencer carbines were not present at the Battle of Gettysburg. Union Brigadier General George Armstrong Custer's Michigan cavalry unit did use full-length Spencer *rifles* in the battle, but there were no carbine-length variants, like the one used by Mary Todd Lincoln, in service at the time.
(at around 1h 3 mins) Little Willie is shown playing with a toy fort that is flying the Thomas Jefferson Flag - 15 stripes and 15 stars - which was never used after 1818. However, the enemy soldiers are British redcoats, suggesting that the set is a history lesson about the War of 1812-1815, where the flag would be suitable.
(at around 47 mins) When Abraham is saying goodbye to Sturges before proposing to Mary. There is a pair of black socks hanging to dry on a rope, later in closer shot, one of them seems like a boom mic but it's still the sock.
The movie occasionally shows the Washington Monument as completed. In reality, construction on the monument stopped in 1855 because materials and workers became scarce when it was only about a quarter complete. It was not completed until 1885, twenty years after Abraham Lincoln's death. However, the film does correctly show an incomplete Washington Monument during all of the scenes set in Lincoln's time; the only time the completed obelisk is shown is in the frame story set in the present day.
(at around 42 mins) After the battle on the horses and the roll down the hill, Abe loses the ax that is picked up and swung by Barts. The ax then hits a log next to Abe's head and it is clearly seen that it bounces against the log.
Several times during the movie, the second floor balcony of the White House is shown. The balcony however was not added to the house until the Harry S. Truman renovation circa 1950.
(at around 28 mins) At the ball where Abraham dances with Mary, the music playing is Estudiantina waltz, or Band of Students Waltz. The Estudiantina waltz, or Band of Students Waltz is a musical arrangement, made in 1883, by Emil Waldteufel, which would be his Opus 191, No. 4. Its melody was composed earlier in 1881 by Paul Lacome, with lyrics by J. de Lau Lusignan.
(at around 19 mins) Abraham expresses to Henry an interest in becoming a vampire hunter when he's about 20, i.e. around 1829. Henry shows Abe a magic lantern slide show including several photographic portraits in Daguerreotype style which was not around until about 1838, the date of the first known portrait photographs. In 1829, only the most primitive, experimental, still photographs requiring extremely long exposure times were possible.
Lincoln is shown making his office in the Oval Office of the West Wing, which began construction in 1902. William Howard Taft was the first president to use it in 1909. Abraham Lincoln's office was a rectangular room, now known as the Lincoln Bedroom, on the second floor of the White House.
In a scene showing the US Capitol Building, there is recessed electrical lighting on the overhang of the building.
(at around 23 mins) Just after meeting Mary Todd while working in a small store, Abe receives a letter from Henry. While Henry's voice reads the letter aloud in a voiceover - "Your prescription awaits you at the local pharmacy. Ask for Aaron Stibel, Junior." - the actual letter says nothing of the sort.
(at around 1h 3 mins) Soon after Lincoln laments how through twists of fate he found himself at 50 years of age the father of a nation that was tearing itself apart while trying to be a father to a boy not much older than he was when he lost his mother, he is told that "3000 more [are] dead". The audio for that phrase does not match the visual.
(at around 52 mins) When Lincoln is on the boat coming into New Orleans, St. Louis Cathedral is on the upper right side of the river. That part of the Mississippi River is the only section that flows north, meaning, instead of coming down the river from St. Louis the cathedral should be on the left, they were coming up the river from the Gulf of Mexico.
(at around 18 mins) When Abe gets his vampire hunting axe, it's treated/laced with silver along the edge of the blade. The problem with doing this, is that the "treatment" would eventually wear off. And the more he used it, the faster it would get closer to losing said treatment. Thus, eventually becoming useless against vampires.
What should have been done, is to create a whole new axe blade and mix in a small amount of silver. Though silver is a soft metal, even a trace amount within the metal itself would last much longer than simply pouring it along the edge.
Furthermore, silver melts at roughly 1000 degrees Celsius, so pouring it on an axe head would have ruined heat-treatment of the edge.
What should have been done, is to create a whole new axe blade and mix in a small amount of silver. Though silver is a soft metal, even a trace amount within the metal itself would last much longer than simply pouring it along the edge.
Furthermore, silver melts at roughly 1000 degrees Celsius, so pouring it on an axe head would have ruined heat-treatment of the edge.
(at around 21 mins) Lincoln writes to Henry Sturgess, "Life in Springfield is less than desirous." He should have written "desirable," as "desirous" means "having desire".