the conflict with Sato was lame
He literally just goes up to Miyagi to challenge him to fight every now and then, only to be pushed aside again and again due to some script contrivance. If he was really that eager to kick Miyagi's ass, he should have just went at him regardless of circumstance. Having bullshit reason again and again as to why they won't fight just turned Sato into a bit of a joke.
And the actor doesn't sell the role very well either. He just resorts to shouting every line of his like a frigging throat cancer patient. Even his karate skills aren't well displayed, as all we see are him trying to chop a log of wood in half... and fail. Some menacing villain, huh?
All in all, the conflict with Sato was what stopped me from enjoying this movie. He's a lame, poorly acted villain with no sense of menace to him as the script keeps using contrivances to prevent him from engaging in a full-on fisticuff with Miyagi. It's a shame, really, 'cause there's a lot of stuff I like about this movie.