Continuity mistake: After Mulan breaks the winged sculpture she chases the chicken and runs past a couple. A mere second later Mulan is in a different place: the stuff on the wall has vanished, the ladder and, of course, the couple. There's a brief shot afterwards where you can now see the ladder but the couple is nowhere to be seen. The whole editing is a mess.
Continuity mistake: After the first clash with the Witch, as the narration says Hua Jun 'dies', but Mulan lives. The close-up on the blade shows a hand gripping it a couple inches below the blade, while whenever we see her face, before and after that close-up, she is holding it with her finger alongside the guard. (01:03:45)
Continuity mistake: The commanding officer (Donnie Yen) intervenes to stop the sword-pointing nonsense with his kung-fu badassery. He easily disarms the two litigious rookies and holds both their swords, but the pose he strikes is a different one in the two shots; Mulan's family heirloom is held alternatively low and high. (00:29:55)
Continuity mistake: Once Mulan has reached the top of the mountain with her buckets, the action moves to the Rouran troops assaulting a city. Gong Li's witch is womanhandling a bunch of soldiers who try to impale her. She grabs a spear a few inches away from its feathers, but in the next shots her hand is covered by them. (00:50:50)