Continuity mistake: When Daniel catches the fly with the chopsticks, he catches the fly in the middle of the sticks. When the shot changes, he now has the fly with the tips of the sticks.
Continuity mistake: In the scene where Mr. Miyagi teaches Daniel defensive moves, Daniel blocks Mr. Miyagi's punches with his right hand on the 'paint the fence' move. Daniel then leaves his right hand high, in a defensive position. This shot is taken behind Daniel, over his left shoulder. The next shot, a side view with Daniel on the right of the screen, shows Daniel's left hand held higher, as if he'd used that hand all along.
Continuity mistake: In the beach party scene when the boom box is thrown at Daniel he catches it with the speakers facing away from him, but when it was thrown the speakers were facing him.
Other mistake: During the final match, Johnny scores his second point with a forearm to Daniel's side. However it is incorrectly announced as a kick to the side. Johnny was on one knee at the time and in no position to kick him. Also, you can see Johnny throw a forearm and not a kick.
Continuity mistake: Before the dance in Mr. Miyagi's work area you can see the red shower curtain with the polka-dots that Danny wears to the dance hanging on the wall. After the dance, when Danny is in the work area after getting saved from the Skeletons, you can still see the shower curtain on the back wall.
Suggested correction: The mistake assumes Mr Miyagi only had one shower curtain. Many people have more than one to replace the current one when it's worn or so dirty with soap scum they are cheaper to replace than try to clean.
Audio problem: In the external shot of "The Orient Express Restaurant" where Daniel's mum sits down and says, "Guess what? I'm going to be training as a manager.", her mouth isn't moving at all.
Continuity mistake: At the beginning when Daniel is playing soccer on the beach, he has a huge sweat stain on the back of his shirt right before he runs past Ali. Moments later, when he runs away from Ali, the sweat stain has drastically reduced in size.
Continuity mistake: In Daniel's first match, when he scores his first point, the bleachers are packed to capacity but just before the next point only 7 rows of seats are partially filled. The referee (with the red shirt) can also be seen sitting down in this shot on the right side, when she is actually refereeing the match).
Continuity mistake: When Daniel gets the spaghetti and sauce spilled all over him, his white pants are drenched with sauce all the way down to his crotch area. When he gets to Mr. Miyagi's house, he only has one faded streak of sauce on each leg and the rest of his pants are clean.
Other mistake: In the scene where Johnny and the Cobra Kais are arriving at the beach, prior to Johnny first spotting Daniel giving Ally soccer lessons, you can see a rolling helmet in between the Cobra Kais' dirt-bike pack while the bikes are still in motion.
Continuity mistake: When Mr. Miyagi saves Daniel from the Kobra Kai during the night of the Halloween dance, Mr. Miyagi flips Johnny to the ground and only strikes him in the stomach. The next morning, when Daniel and Mr. Miyagi go to Kreese's dojo, Johnny is seen with a black eye. Very hard to get one since he was never hit in the face.
Suggested correction: When Miyagi dropped him, the black eye could very well be from a bump in the ground or a rock.
From the way Johnny was flipped, he landed on his back; unlikely he could have injured his eye.
Continuity mistake: When Daniel first moves into the apartment, he kicks the outside door open. Then we immediately see Daniel from the inside, and the positions of the pedals on his bike has changed.
Audio problem: During the dance scene, when Ali and Daniel open the shower curtain prop and see the chicken running towards them, you hear Daniel say, "He's wild." But his lips do not match him saying that at all.
Continuity mistake: When Johnny is fighting in the competition at the end of the movie, his hair changes from being clean looking to looking sweaty, back to being clean.
Deliberate mistake: I have participated in several amateur karate tournaments over the years and I have yet to see one that is full contact without any protective equipment whatsoever, especially one in which all of the participants are minors. All of the contestants should at a minimum have had mouth guards, gloves and foot pads.
Audio problem: At the Country Club Dinner Dance, the band is playing the "Fascination Waltz", but the conductor's baton is at a faster tempo.
Other mistake: When Daniel, Miyagi, and Alli enter the tournament arena, they are stopped by a referee who says only fighters and coaches are allowed on the floor. They use the excuse of Ali being a translator to get her by. As they move forward you can see children in street clothes, girls with purses, old ladies, and others who are obviously not fighters or coaches.
Revealing mistake: When Mr. Miyagi beats the Cobra Kai guys dressed like skeletons you can see the stunt double (Fumio Demura) doing it for him.
Other mistake: When Daniel and his mother have to bump start the car, she shouts to Allie to pop the clutch. There is no tell tale sign of the car reacting to the clutch being dropped, and the sound of the engine starting is preceded by the sound of the starter motor turning as if the key was used.
Audio problem: During the beach fight between Johnny and Daniel right at the time Daniel runs at Johnny and Johnny trips him for the FIRST TIME, you can see some of Johnny's friends holding Ali back as she yells, "Johnny, Stop It." But if you look close, it is easy to tell her lips aren't moving at that point.
