Continuity mistake: When unconscious Michelangelo is lifted up and put on a cart, a man suddenly appears on the left.
Continuity mistake: When Michelangelo's horse is about to stop galloping, the wide shot shows his right hand lowered and his body bent downwards, but in the close-up his hand is raised. This swaps back and forth. Seemingly, the wide shots were of a puppet of some sort used for security reasons.
Continuity mistake: When the soldiers smash April's Walkman, pieces get scattered all over the place. In the close-up they're very close together.
Continuity mistake: At Norinaga castle, Kenshin walks towards the Lord and kneels down. The number of people around them change between shots. Also, the horse on the far right that started walking away is suddenly next to the soldier.
Answer: It might just be incidental music, but it sounds more like a variation of "Yoshi's theme" (an original score for the film), which was meant to sound like traditional Japanese music.
Bishop73