Continuity mistake: When the soldiers arrive at the city that has been destroyed by the Huns, there are no footprints except for those of the soldiers. But there should be thousands of them left from the Huns ,army, and villagers who battled there. (And this was not because it snowed and covered the prints up. If it had snowed the buildings would be white.)
Continuity mistake: When Shan Yu is laughing on the rooftop, there is a shot of the terror-struck crowd. In this shot the dragon the Hun soldiers are hiding under is facing to the left. When they burst out of it, it is facing straight in front of them.
Continuity mistake: When Mulan is in with the matchmaker, she starts to pour the tea and spills a bunch of it on the table. A few seconds later she climbs on top of the table to take the tea with the cricket away from the matchmaker. She crawls right onto the tea on the table but has no wet marks or anything on her and the tea is no longer there.
Continuity mistake: In the scene where Mulan throws the tea onto the matchmaker, the matchmaker only has a little bit of blush on that is really light, but then when she has a close up to her face, there is a lot of blush on her cheeks and it is a much brighter pink. This has nothing to do with her being mad because only the blush changes not her whole face color.
Factual error: During the morning training session, Shang shot an arrow to the top of the pole so his soldiers can get it, but the arrow is stuck in a horizontal position. A difficult position to achieve, for someone shooting an arrow from below. Even if the arrow hit the pole at such a point in its arc, its kinetic energy would be at its weakest, preventing it from boring into the pole.
Continuity mistake: During the final battle scene, Mulan is seen on the roof of the palace, lining up a shot with the rocket. She backs up, and Shan Yu bursts through the roof, leaving a large hole. As Mulan and Shan Yu fight, the hole disappears for a few shots. But later, after Mushu fires the rocket into Shan Yu, Mulan runs off the roof, jumping over the hole, which has reappeared.
Deliberate mistake: When the troops are marching towards the village which is now destroyed, they would have noticed it long before they actually do. (The makers did this on purpose so that the song "A Girl We're Fighting For" would end on a good note).
Continuity mistake: When they are singing 'A girl worth fighting for' look closely at the their chest plates. They change colour from time to time.