Continuity mistake: When Xianniang chokes Böri Khan the position of her fingers changes between shots. Note how the index finger is separated from the rest in one shot, or close to the others a shot later. (00:12:29)
Continuity mistake: When Mulan baths in the river and his friend enters the water, a strand of hair along her left jaw appears and disappears randomly.
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 jumping off the roof, Mulan smiles at her dad while neighbours walk away, and a strand of hair falls over her forehead. A shot later her hair is brushed. She didn't move between shots.
Continuity mistake: When young Mulan is chasing the chicken, a man walking down the stairs is suddenly several steps behind, repeating all previous movements. (00:01:57)
Continuity mistake: When Mulan watches the flying burning catapult balls her hair is behind her shoulders. In the close-up it's over her shoulders. (01:08:51)
Continuity mistake: When Mulan steps on the winged sculpture the ramp next to the steps is clean, a shot later it's dirty and with mud all over. (00:02:00)
Continuity mistake: In the desert, when a man sees Xianniang he wipes is face with a handkerchief. The way he holds it changes between shots.
Continuity mistake: After slipping down the roof, Mulan smiles at her father and bends her arm. From the opposite angle the arm is lowered. (00:03:00)
Continuity mistake: When Mulan's mom and dad talk, the cloth on the table changes positions and shape between shots. (00:04:22)
Continuity mistake: When Mulan moves the teapot to trap the spider, the teapot is at different distance from the tablecloth depending on the camera angle. (00:17:20)
Continuity mistake: When Mulan is back home and her mother hugs her, in the first shot her hand is on Mulan's shoulder, on the top, but after the cut it's behind it. (01:40:35)
Continuity mistake: Mulan opens her armor to extract the throwing weapon blocked by her makeshift corset. In the first close-up the long strand of hair that was in front of her left hand is gone, and in the second one (when she pulls the weapon out) her left hand is holding the armor below the dagger - it was above it before. (01:04:25)
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: 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)
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: Chen Honghui extends his hand to "the little man" to help 'him' back on his feet, but Mulan pulls her sword on him. The sword strap dangles freely in the shots by the side, but it is held up in the close-ups of the blade pointed at his neck. (00:29:45)
Continuity mistake: On the way to the conscription office, Cricket introduces himself, or tries to do so, but the token bully starts tormenting him by prodding his ear with a small straw. The straw has split ends which make noticeable the fact that the straw is turned at a different angle between shots; the second time he gets poked in particular, the smoother end is floppy and tilted downwards in the wide angle, straight and horizontal in the ear close-up. (00:29:25)
Continuity mistake: Mulan is having dinner with her family after her father has been drafted. During the scene depending on the camera angle her arms are folded, or her right arm is leaning against the table while she is holding chopsticks in midair. (00:20:55)
Continuity mistake: Mulan sheds her armor and is back to the battlefield, where she begins mowing down the bunch of Rourans. When she impales her last one, look at the shot when Yifei Liu is barely in frame; you can tell that there's just a tiny portion of her by her eye, but when the camera is focused in the next shot on the cool pose that sends everyone else hightailing, there's a lot of hair down that side of her face. (01:06:25)
Answer: Although it isn't said (in either this film or the animated original), she reports to a different camp than anyone else in her village. Otherwise, the men would not only recognize her physically but they would know beforehand that Hua Zhou never had a son so the ruse would never work. How she knows nobody from her village will be at that particular camp is never explained in either film.
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