Continuity mistake: In one extended scene, Chris O'Donnell is talking with someone. Almost every time the camera comes back to him, the ties on his shirt are first crossed, then uncrossed, etc.
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.
Continuity mistake: Amon Goeth pulls out a German Luger to shoot the rabbi. The Luger jams so Goeth pulls out another pistol and pulls the slide back indicating a semi-auto handgun. The second also fails. Goeth gets frustrated and throws the gun on the ground. When the other Nazi picks it up, it's magically a revolver. (01:28:05)