Booth is seen entering the President's theater box on the President's left; he even opens the door first to make sure the President is there. He then shoots him at a distance of at least 5 feet, again from Lincoln's left side. In reality, Booth entered the box from behind the President, and shot him at very close range in the back of the head. Also, in real life Booth shot Lincoln immediately after the line "...you sockdolagizing old mantrap!", thus insuring that the audience laughter would drown out the sound of the shot (Booth was very familiar with the play and knew just when to shoot). In the film, the line in question is uttered before Booth has even made his way into the box.
Two errors with respect to the conspirators trial and hanging scenes. First, Mrs. Surratt is seen with a hood over her head in the trial scenes; in reality, she was the only one of the prisoners not required to wear a hood at any time. Also, the hanging is depicted as taking place at night when, in reality, it took place on a scorchingly hot July day.
Booth and his accomplice, David Herold, are seen riding away from Ford's Theater together, through the streets of Washington. In reality, Booth rode alone through Washington, and did not join up with with Herold until many miles outside the city.
Booth stops and asks for the nearest doctor, and the bystander suggests Dr. Mudd, and gives Booth directions to the Doctor's house. In reality, Booth knew Dr. Mudd quite well, and knew just where to go for medical aid the night of the assassination (he had even stayed at Dr. Mudd's once, and so had no need to ask for directions). Also, in the film, Booth and Herold stay only a few minutes in Dr. Mudd's house, and then leave. In reality, Booth and Herold stayed the night at Dr. Mudd's, and were even served breakfast the following morning.
The exterior of Dr. Mudd's house as presented in the film bears no resemblance to his actual house, which was a plain, square, two-story house with no gable windows or fancy set-backs.
The artillery piece that fires at the ship from Fort Jefferson is fired by touching a burning torch to cannon fuse. BUT artillery of this time period was set off pulling a lanyard attached to a friction primer. When pilled, the friction primer ignited its gunpowder charge, which in turn, set off the charge in the cannon's barrel (thereby sending the cannon's projectile on its way).
At 1 hr 20 min one of the black soldiers is speaking but no dialog is heard.