Other mistake: When Jimmy Stewart talks to George Kennedy about the taking of his son as prisoner. Right after they look at the map. Look over the shoulder of Kennedy in next few frames. You can see a white vehicle move across the horizon under the mountains. Looks like a white van or truck. With a HD TV, you can even see the dust trail as the vehicle moves left across screen.
Shenandoah (1965)
1 other mistake - chronological order
Directed by: Andrew V. McLaglen
Starring: James Stewart, Doug McClure, Patrick Wayne, Glenn Corbett
Factual error: After the birth of the baby, James Stewart and "Doc" Witherspoon are discussing the course of the war. "Doc" relates that he has always lived in Virginia and that his son died at Gettysburg at Little Round Top. No Virginia regiments fought at Little Round Top - only Alabama, Texas, Georgia, and Arkansas regiments.
Pastor Bjoerling: Charlie Anderson, I wonder if you'd be good enough to tell me why you even bother coming to services. Meaning no disrespect, of course.
Charlie Anderson: It was my wife's last request, Pastor Bjoerling. Meaning no disrespect, of course.