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Continuity: When Sonora is trying to learn to mount Lightning while he's moving, she falls repeatedly throughout the scene. Her shirt gets a bit of blood on it after one fall, then it gets dirty and more bloody, but sequential shots jump between clean with a little blood and dirty with lots of blood.
Continuity: At the beginning of the movie, when Sonora gets challenged to jump Lightning over the fence, she tears off a piece of her dress and ties it to Lightning's halter. There is no bit because she did not have one. But as Lightning begins to trot, there is now a bit in his mouth. Also, the piece that she tears off of her dress changes lengths significantly between the shots where she's tying it onto the horse and when she gets on him and starts riding.