Continuity mistake: At the start of the movie when the people are training, Wimp Lo and Ling come out, the camera is right where those people were practicing and you can't see any of them, but you can still hear the noises of them practicing. (00:12:55)
Continuity mistake: When everybody is beating Chosen One with the sticks and piles up on him, look closely at the two shots; the people change positions.
Continuity mistake: Before the chosen one smacks a hole in the guys chest at the start, just before the people charge him there are two shots of them. The people change positions between the shots.
Continuity mistake: When Betty goes outside to show his skill, the Chosen One is holding a fish bone. However, he did not have it in the shot before.
Continuity mistake: In the scene where Ling is putting mercury on The Chosen One's hand, she tells him to 'rub it in my hair', but look closely at The Chosen One's hand. Now the mercury, salt, and lime is gone, indicating they washed it off for the next shot.
Other mistake: When the Chosen One asks for a pound of nuts, he's handed a thing of flowers, not nuts. In the next scene we now show him feeding the "nuts" to a squirrel.
Revealing mistake: When Chosen One and Ling are talking and Chosen One says/shouts, "I implore you to reconsider", look at his head as the camera zooms in. After the zoom stops, you can see that Chosen One's head "grows" for about a half-second, the result of a flub-up of the special effects. (His face is pasted onto another actor's body.).
Continuity mistake: In the training scene when Chosen One feeds his tongue a small piece of food, the piece changes between shots and is larger in the second shot.
Revealing mistake: During the scene where Betty is at the table with the Chosen One, when the camera is behind the Chosen One, you can see a mustache on him sticking out on the side. The Chosen One does not have a mustache. This also happens when Betty is performing his skill. This is where Steve Oedekerk is replacing Master Tang instead of the Chinese guy he usually does. (00:25:35)
Continuity mistake: When Chosen One is fighting the army at the beginning and pokes out their eyeballs, his hands are close to his neck, but in a wider shot his hands are farther away.
Continuity mistake: When Master Tang is in bed and Wimp Lo says "I'll do it", you see a curtain behind his head. In a back shot of him, the curtain is in front.
Continuity mistake: When Chosen One tries to find out if he can be hurt when people hit him with sticks the first person who hits him has his hat fall off to the side of him. In the rest of the shots, it showed it falling in front of him.
Continuity mistake: When the guy has his whole leg cut off when they are talking about the tiny net, nobody is sitting right by him, but when it shows his leg, you see other legs right by him.
Continuity mistake: When Chosen sees all his friends wounded in the field, he has a tattoo saying "mouth" with an arrow on his left cheek. The tattoo can't be seen after this scene. There was a deleted scene where Chosen One was captured and tortured, one of the tortures was to tattoo an arrow that said 'mouth' on it. In another one, the "one boob" woman uses magic to erase it. Still a mistake, but there's the reason. (00:54:45 - 00:56:15)
Continuity mistake: The face on The Chosen One's tongue disappears and reappears throughout the movie.
Continuity mistake: When Master Tang is coughing in bed, and Ling is patting him,she is patting him with her left hand in the first shot, in the next shot she is using both hands.
Continuity mistake: When the Chosen One is meeting with Master Tang, in the first shot you see that Master Tang is sitting down. However when Chosen One says "and that day, I vowed to find the man who killed my family", you see Master Tang walks past the Chosen One. (00:13:20)
Continuity mistake: When everyone circles the Chosen One at the start of the movie, it is a small circle and in the next shot, the circle gets bigger. (00:10:40)
Continuity mistake: At the start when you hear the Chosen One's story, in some shots he has white clothes on, and in other shots he has brown clothes on.
Revealing mistake: When the Chosen One fights Betty in the water he gets knocked down. When he gets up you can see that it's not Steve Odenkerk but the guy who was in the original kung-fu movie they added people and audio to.
Answer: Some scenes/shots were taken from the old movie, while others were made specifically for this movie. Additionally, numerous shots were "composited" to place new characters in the old footage.