When the young Air Force man is giving Mr Miyagi and Daniel
directions to his village in Okinawa, he asks the "Sarge" where it is. The sergeant then replies, "You are standing on it corporal." There are no corporals in the Air Force, and his rank was actually an Airman First Class (E-3) with two stripes. The correct response from the sergeant should have been, "You are standing on it airman."
After they left the air base, it was daytime. They drove over a small bridge, and in the next shot, they were on the other side of the same bridge but it was then much darker out as if they had been driving for a while.
When Daniel and Kumiko are in the hut having the tea ceremony, we see Kumiko unclip her barrette and her hair falls and is blown about by the heavy winds. In the next shot, as she goes to kiss Daniel, both her and Daniel's hair and clothing are motionless.
At the cannery, Mr. Miyagi releases a hook from the tower and dodges it, and the sharp point slams into the wood behind him. Daniel asks him if he can try, and Mr. Miyagi climbs to the tower to reset the hook. However, when he is raising the hook, there is a large piece of wood covering the hook (as a safety). When the hook gets to the top, the hook is bare, and Mr. Miyagi places the same wood on the hook.
The film portrays Okinawa as a lawless place, where fights, kidnapping, and attempted murder are happening blatantly with little to no reaction by the authorities. In reality, Okinawa has a fully equipped modern police force which diligently enforces laws, due in large part to the high number of Americans on the island and a desire to avoid any type of serious incident.
During the bar scene, Daniel claims that a man is "standing wrong" to perform an ice breaking technique, so he could only break through 2 pieces. The man then challenges Daniel to do better -- break at least 3 pieces. When Chozen offers 3:1 odds against Daniel breaking the ice, several patrons excitedly place a bet in favor of Daniel. Then, the man seeks to clarify the bet asking "Hey, he's gotta break all 3 right?" Chozen responds "Wrong, all 6." Afterwards, the crowd gets more excited and places more bets. This does not make sense. Any bets already made became worse upon knowledge that Daniel had to break all 6 pieces to win instead of 3. If anything, the crowd should have been withdrawing their bets instead of excitedly making more bets.
When Daniel accidentally knocks over Chozen's scale, Daniel breaks one of the weights, revealing it is fake and prompting the farmers to yell, "So you cheat people!" But this would mean a cheat in the farmers' favor. However, Sato owns the land and may charge a fee to the farmers for how much they produce. If it appeared they produced more than they actually did, the fee to Sato would be greater. However, The weights used are Lead which is heavier than iron so this would net a gain for Sato. Example, if they offer to buy 10lbs of rice from a farmer but the counter weight they use is actually 12lbs then they are getting 12lbs for the price of 10lbs.
While in Okinawa and Japan it is normal for the driver's side to be on the right side of the car for left lane travel, many left hand cars were transported to the island by members of the US military for personal use and subsequently left there. This is why Sato's personal car is left hand drive.
During the times when characters are speaking in Japanese, in the Spanish translation version of the movie it is translated into gibberish. They simply try to sound Japanese, but in reality are just making noise.