In the scene where Shang's troops first encountered the Huns on the mountains. After the Huns started pouring rain of fire arrows, the horse cart was set on fire. They had to take the cannons and run, after that, Mulan DREW her sword, cut the horse loose, jumped on it and ran with the sword still in her right hand. The cart blew up, in a split of a second, she was thrown to the ground and the sword magically GOT BACK into its case...

I've looked at many slip up sites, but nobody got this!