Revealing mistake: In the Fredericksburg battle scene, just after the Union officer orders the men to fall back, there is a 1 or 2 second close-up shot of a Confederate soldier taking a hit and falling back. As he does, a modern wristwatch is visible on his left wrist under the sleeve of his coat.
Revealing mistake: DVD Side B. Just before the cannon burst near General Lee and his officers at Fredericksburg, you can see a Confederate soldier with the sponge rammer using it to the side of the cannon bore. This cannon must have been a actual field piece since the bore in the scene was most likely blocked. The sponge rammer consisted of a sponge-head of elm or poplar and covered with wool. The number one man of an artillery crew drove the sponge to the bottom of the bore and turned it numerous times to put out any embers from the previous firing of the piece. The rammer head was made of hard wood, generally elm or beech. The number two man would place the shell inside the bore, and number one would use the rammer to shove it down the bore with a single stroke.
Revealing mistake: When the Yankees are moving along the field taking artillery fire, a shot shows a shell landing in a group of men, in which a few go flying. When one lands in front of the camera, you can see the ground lift up and the sound of him hitting the mat instead of the ground. (On Disc 2).
Revealing mistake: When Lee, Longstreet and Jackson are riding through the streets of Fredricksburg, just after the old man has spoken to them, the damaged houses in the background are obviously from a painting. Easiest way to tell is that the street is full of people, up until a certain point.
Revealing mistake: Towards the end of the movie, as Jackson's Corps is attacking the exposed Federal right flank during the Battle of Chancellorsville, when the Confederate forces begin overrunning the Federal encampment, they sweep past two artillery pieces. Notice the second gun - it has a blocked barrel (filled with concrete). Must have been a memorial piece that was on/near the Chancellorsville battlefield.