Errors in geography: In the plane to Japan, Mr Miyagi tells Daniel to look for Tomi Village "south of Naha, along the sea" on the map of Okinawa. Daniel mentions there is an air base (later identified as Kadena AB) there. Kadena Air Base is in fact north of Naha City.
Revealing mistakes: After Miyagi fights Chozen and his friends, he runs by a concrete statue to see if Daniel is okay. The statue moves a bit. The next scene shows Chozen kicking this statue and supposedly breaking it.
Factual errors: 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."
Continuity: The stolen money recovered from Chozen shifts between Daniel's left and right hand during the chase scene.
Errors made by characters (possibly deliberate errors by the filmmakers): When Mr. Miyagi goes to put his glasses on when he receives the letter at the beginning of the film, he sticks one of the arms of his glasses in his eye by accident before putting them on properly.
Miscellaneous: 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.
Errors made by characters (possibly deliberate errors by the filmmakers): When Sato helps Daniel during the hurricane, he tells Chozen "Now, to you, I am dead." But when Chozen is fighting Daniel towards the end, he tells Sato "I cannot hear you Uncle, I am dead to you, remember?"
Errors made by characters (possibly deliberate errors by the filmmakers): The Air Force soldier tells them he has never heard of Tomi Village. Tomi Village is right on the other side of the fence from where they stopped in the air field. How could Mr Miyagi not know where it was if it was that close to the Air base?
Continuity: 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.
Factual errors: The car that Daniel and Mr. Miyagi get in at the airport - the driver is on the "American" side. They drive on the left side of the road in Japan, so therefore, the driver should have been on the right.
Audio/visual unsynchronized: In at least one version of the film, during the scene where Daniel is being challenged to break the ice blocks and Miyagi is talking to him, suddenly Miyagi's voice is heard over the film dialogue saying "HOT DAWG!", which is from his "Happy Days" role.