Continuity mistake: Check the glass of water on the table in front of the little girl. When they shoot from afar, you can see the level of the water is lower than when she actually picks it up to drink it. (00:12:15)
Continuity mistake: After the 2nd battle (when Joan got an arrow in the chest) she wakes up her soldiers the next morning and uses the tower to break down the English bridge. At the bottom of the bridge when its falling (inside the fort), no one is near the bridge when it's falling except the guy who bad-mouthed Joan earlier that morning. Then in another shot there are at least eight guys getting crushed by the bridge.