The Karate Kid Part II (1986) - 3 major mistakes

Plot hole: In the scene where Chozen is buying vegetables from the villagers, one of the weights from the scale is knocked onto the ground. Daniel picks it up and realises that its not a real weight and breaks it in half. If Chozen wanted to cheat the villagers when he weighed their vegetables, he would need weights that were heavier than normal, not lighter plastic ones. Lighter weights would mean that Chozen would need to add far more of the light weights to make any amount of vegetables balance out, therefore he would be paying more for the vegetables than they are worth.

Continuity: When Daniel is about to break the six pieces of ice, the slabs of ice change from shot to shot. In one shot the 5th piece from the left is peaked and taller than the others. In the next shot of the ice the 3rd piece from the left is the tallest piece of ice.

Continuity: When Daniel uses the Miyagi drum technique against Chozen at the end of the film, the third blow travels from Daniel's left to his right. So Chozen should falter back to his own left. But when the shot cuts back to over Daniel's shoulder, the blow sends Chozen to his right instead.