Continuity mistake: When young Joan is lying in the field and finds the sword, she points the sword towards the sky, and the side handles are vertical with her body. Then in the aerial shot going toward her, this time and throughout the rest of the small part, the side handles are horizontal with her body.
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.
Continuity mistake: When Joan has the arrow in her chest, she rips it out and blood splatters everywhere. In one shot its all on the right side of her face, some dry and some droplets of blood on her cheek. Yet when the medic comes after she's fallen asleep, he kneels down to check if her hearts beating, but there is only a tiny tickle of blood on her cheek, then a closer shot appears with blotches of blood - dry and wet - on her face.