Factual error: In the scene where the fireflies light the fireworks there is one problem: The chemical that creates light wouldn't ignite the wick on a firework.
Factual error: When Mushu is reading the pink slip he reads it the English way which is from left to right, what he should have done is read it up to down, and right to left.
Continuity mistake: When Ling gets punched in the face by the girl that offers him tea, when they are singing a new version of "A Girl worth Fighting For" his black eye disappears.
Continuity mistake: In the scene when we find out that Shang is alive, we see a stick floating through the water which gets caught by a tree trunk sticking out. Then when the shot goes into a close up for Shang coming into frame, the stick has suddenly disappeared.
Continuity mistake: In the first movie the tombstones of the Fa family ancestors were shiny like a mirror, now in the second film they are just normal stone tombstones.
Factual error: In the scene where they are showing the fireworks at night, then they switch to daytime and the fireworks are still going, this if fine but it needs to be almost dark for fireworks to show up.
Continuity mistake: Just before Mushu forces the wagon to go out of control (after trying to break up Mulan and Shang) Mushu throws his bandage and it wraps around the spoke of the wagon wheel. It is initially tightly wrapped around the spoke, but in the next frame it is hanging loosely from it.
Continuity mistake: When Mushu is talking to Crick-ee about breaking up Mulan and Shang, and Crick-ee is standing on the barrel, from one angle he is in the middle of the barrel, from the other angle he is on the edge.