Continuity mistake: At the beginning of the movie when the scout is talking with Longstreet, when the scout holds up his finger and says "you didn't know they were on the move out there", a long stream of troops is seen marching to the right. When the shot cuts to Longstreet then back, they have disappeared. (00:09:55)
Visible crew/equipment: During the scene when the confederate regiment begins to move up little round top, right after the "7-8 bullets shoved down the barrel line", a audio technician and boom mic can be seen to the left side of the image hiding in the trees. (01:57:15 - 01:57:50)
Character mistake: When Buster gets hit in the arm the first time, he is busy tying the kerchief below the wound. (02:21:05)
Revealing mistake: In one of Pickett's charge scene the bayonets are obviously rubber.
Revealing mistake: A jet con trail can be seen just before the fight at Little Round Top, when Chamberlain and Tom are talking.
Revealing mistake: There are white wristwatch marks on the tan arms of the Confederate soldiers as they reach for Lee as he rides among the troops.
Continuity mistake: On the first day of the battle when Longstreet and Lee are talking, Longstreet's cigar is unraveling and in the next shot he has a new cigar.
Revealing mistake: Just before Pickett's charge, there are a number of shots of drummer boys playing the drums. Their drums have plastic drum heads with the "Remo" brand name on them.
Revealing mistake: In the battle of Little Round Top, as the Confederate soldiers are backing down the hill there is one man walking backwards and loading his gun. Behind him another soldier aims his weapon and fires, shooting the first man in the side of the head. The man then ducks and waits for the smoke from the shot to clear and continues down hill.
Revealing mistake: In several scenes where the cannons are firing, they either don't recoil or recoil very little. In real life, they would have a bigger recoil.
Continuity mistake: After Chamberlain's bayonette charge, he sees his aide wounded for a second time. The scene changes angles back and forth during their talking of how brave the boys were. An American flag is over the shoulder of the aide on close ups, but on a longer shot the flag is leaning against the tree.
Factual error: During the engagement of the 20th Maine in defense of Little Round Top there is a tremendous amount of firing going on as they repel charge after charge of Confederates. Yet, there is not a single leaf, or tree branch, that falls to the ground. With that amount of lead flying around there would have been debris everywhere. There are actual Civil War accounts where whole trees were cut in half by bullet fire.
Revealing mistake: In the scene where Chamberlain is walking with his brother just after Little Round Top and before they get to the safe part of the battlefield, there is a jet con trail in the sky.
Continuity mistake: At the beginning of the movie it is dawn of June 30th, but should be dawn of 29th. Harrison the scout completes his task and reports to Gen Longstreet. Longstreet confers with Lee and it is now evening. The next several scenes show a new dawn when Sorrell asks if he should wake the men, Buster wakes up Col Chamberlain and a bit later Gen Buford arrives in town with his cavalry and no fighting yet. This second dawn should be June 30th, not July 1st, the first day of the battle. Further that day ends with Buford drafting report for Gen Reynolds.
Continuity mistake: During the sequence at Little Round Top, the same footage is used twice. The 20th Maine soldiers discharge a volley of musketry and there is a shot of a Confederate soldier being bodily flung backwards. A short time later, the Union defenders send down another volley and we see a close-up of another Confederate falling. Only it's the same actor, same footage, from a different camera about 35 feet down the Union line.
Visible crew/equipment: Lights from what appears to be the high school football field are visible in the distance during Pickett's charge.
Revealing mistake: There is a scene in which Union soldiers are standing on Little Round Top. You can see the General Warren statue, which is partially hidden by shrubbery.
Factual error: When General Buford looks back toward Gettysburg from the cupola of the Lutheran Seminary building to see if the First Corps is approaching, the director used a colorized photograph of the town taken by Matthew Brady a few weeks after the battle to illustrate Buford's view. Unfortunately, the photo was taken from a point north of the Chambersburg Pike and the Lutheran Seminary is south of it.
Factual error: There are several scenes which show an American flag with way too many stars for that time period.