There's no way around it: battle sequences are tough to film.
First, just capturing the mere scale of the battles is a challenge, then you have to get all the technical aspects and military minutiae down. And that's just the tip of the iceberg. When all the hours of footage are shot, filmmakers still have to go to the cutting room and turn them into the adrenaline-pumping scenes that we all love. Even with all of that attention to detail, research, and expert storytelling that goes into them, they're not without their faults. And, as evidenced in the photos above, some of them are glaring.
As usual, all photos are courtesy of MovieMistakes.com.