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.
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.