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Revealing mistakes
Towards the end, in the training sequence of both Daniel LaRusso and Mike Barnes, the first two clips shown of Mike Barnes, Terry Silver, and John Kreese (where Mike is breaking bricks with his hands) are the same exact clips, just played twice. The second clip of Mike is about half-a-second longer than the first.
This is supposed to take place 1 year after the events of the first Karate Kid. In the first film we see him turn 16 (Mr. Miyagi gives him a car for his birthday). So one year later he would be 17, yet he was supposed to go to college. Did Daniel graduate High School early? Was he in an accelerated class? Also, if he's still under 18 (which is why he can defend his title in the "All Valley Under 18 Tournament") How did he secure a lease with the real estate agent for the bonsai store? Are people under 18 years of age allowed to enter into legally binding contracts?
Towards the end of the movie Daniel tries to heal his arm using Miyagi's thick light green fizzy substance. In the next scene Miyagi knocks on Daniel's room's door which startles Daniel and knocks down the container with the liquid in it which now simply looks like water without any sign of the green stuff which was there just a few minutes earlier.
When Miyagi comes into the shop as Mike is fighting with Daniel, Mike tells Snake to "get him". After Miyagi drops Snake, Mike then points to Dennis, sort of waving him to go after Miyagi next. We see Dennis start toward Miyagi but in the next frame, Mike is the one going toward Miyagi, saying "come on old man".
When Terry first shows Daniel the front sweep, Daniel's headband changes sides.
In KK1, the All-Valley Tournament announcer cites Johnny as two-time winner of the Grand Championship, back now to defend his title. Yet, at the end of KK3, Daniel is cited as the first person ever to win the Tournament two years in a row.
Obviously Terry Silver is way too young to have served in Vietnam. (The character's age is not stated, but Thomas Ian Griffith was born 1962. He wasn't alive when the war started, and he would have been 13 when it ended. John Kreese's age however, is correct for him to have served.)
When Silver introduces himself to Daniel and Miyagi, he mentions that the 442nd boasted more Congressional Medal of Honor-recipients than all of World War 2 put together. Since the 442nd *was* the Second World War, he probably meant to say World War 1.
When Terry Silver and Daniel are in the Cobra Kai dojo for the first time together and Daniel is attempting to sweep the "knee" of the wooden dummy, the wood is solid and he cannot break it. As Terry Silver prepares to demonstrate the move, a break in the wood of the first leg is plainly visible. Sure enough, that's where his foot makes contact and the wood falls apart. A break in the torso, where he hits it, is similarly visible.
In the beginning when Kreese goes to his now-closed Cobra Kai dojo, he looks at a newspaper clipping about Daniel winning the All-Valley Tournament. You can see the text of the story under the by-line and it has nothing to do with the All-Valley. (Also, the caption of the photo refers to "Mr. Miyagi"--did he not want to give the reporter or photographer his first name?)
When Daniel and Jessica are climbing down the ropes, it's obvious rear projection behind them.
When Barnes holds Daniel and Jessica hostage at the bottom of Devil's Cauldron, Ralph Macchio and Robin Lively are clearly on a set, with the close-by crashing waves they are threatened by being an effect of rear projection. Not only is there a difference in color and sharpness between the foreground and the background, but if you look closely at the point where the two meet, you can see the projection video slightly shaking at times.
It's the dead of night when Daniel goes into the Cobra Kai dojo to talk to Terry, but daylight can be seen coming in through the shutters of the windows.
It makes no sense for Jessica to be angry at Daniel for punching the guy at the dance when the guy was illegally harassing her and even threatening to kidnap her by saying, "She's going with me!" after she rejected his advances. Daniel's use of force against him would legally be perfectly justified.
If the final match were being played to a three-point win, as in KK1, no time limit or sudden-death/overtime should be necessary. Sudden death and time limits would be employed only if there was no set number of points required to win the match.
When Terry Silver is in Mr Miyagi's home, trying to find any information on him, he sees Daniel coming out of his room, and heading towards the doors. He then tries to go out the front window door, but Mr Miyagi arrives home, having him trapped near the door. In the next scene, Daniel walks into the room, and notices the other door open. Terry Silver has suddenly moved up into the chimney. He could not have made it up in there that quickly, (and not make a single noise) for when Daniel sees Mr Miyagi arrive home.
The All-valley Tournament changed the rules so that the reigning champion only has to compete in the final match. This does not make any sense. No tournament in the world handles championships in this way.
If "Money is in very short supply," as Miyagi points out, then why do neither he nor Daniel seem to realize that they can simply sell bonsai trees out of the former's front yard? This would enable Daniel to still attend college, being much less expensive than renting a shop (particularly a seedy dive like the one he rents for Miyagi).
If the movie is supposed to be based 1 year after the original The Karate Kid (1984), that would make it 1985. The body style Mustang GT driven by Barnes and his friends wasn't produced until 1987.
During the tournament after Daniel loses the first point Terry Silver turns to Kreese saying "Take a look at the slope, is that perfect or what?" This line was clearly dubbed afterwards as his mouth says something different.
Towards the end of the final fight, Silver says to Kreese "this is more fun than I thought", but his mouth is clearly saying something else.
When Miyagi sends Barnes flying through the Cobra-Kai door into the dojo, if you look closely, you can see some sort of table (with a blue tinge to it) that Barnes used to jump off of and into the door from.
When Mr. Miyagi fights Mike Barnes, John Kreese and Terry Silver, Kreese lunges at Miyagi, but Miyagi blocks Kreese's punch, ducks down, kicks Kreese in the face and trip Kreese. As Kreese falls to the ground, you can see something small, rectangular and shiny fall out of his shirt (most likely a pocket protector or name tag). In the next shot the thing is no longer on the ground and has completely disappeared.
When Kreese and Silver bow and say "Party time!" to each other before the fight with Miyagi in the Cobra Kai Dojo, the shadow of the person holding the boom mic can be seen in the mirror behind them.
According to Jessica, her (unnamed) boyfriend jilted her for "Elizabeth Ann Rooney" two months ago. However, just hours after calling him a "traitor" and booking her first date with Daniel, Jessica explains that she and her old boyfriend "were both a little dumb about it" and are getting back together upon her return to Columbus. It's never explained how Jessica patched up an 8-week rift in a single afternoon, nor why she would do this right *after* agreeing to go out with Daniel.
The entirety of the conflict revolving around Daniel declining to participate in the All Valley Tournament and Mike Barnes' insistence that he does apparently hinges on Daniel signing a form agreeing to defend his title. The simplest resolution to the conflict would have been for Daniel to sign the paper - thereby eliminating any additional need for Barnes to continue harassing Daniel - and for Daniel just not to show up at the tournament. There was no obvious penalty implied for not attending even if the form was signed.
During the course of the film, Mike Barnes commits several felonies, including some in which he does so in front of multiple witnesses. Apart from a passing mention that he was questioned by police, Barnes is never arrested or even detained. In addition, Daniel would have more than enough evidence for a restraining order, at the very least, and could also easily demonstrate to the karate committee, which runs the tournament, that Barnes is participating as part of a revenge plot (although there is mention Terry Silver may have bribed the committee in order to have Barnes compete.)
Daniel says that face contact would disqualify him. However, when Barnes hits Daniel in the face during the match he wasn't disqualified, he simply lost a point.
Rule #3 of Terry Silver's method involves hitting your opponent square in the nose as he attacks. Daniel objects by saying he'd be disqualified because it's face contact. However, this is exactly what he did in The Karate Kid (1984) when he kicked Johnny Lawrence in the face and won the match. This was mentioned by Johnny Lawrence himself in one of the first episodes of the series Cobra Kai (2018.) He stated that it was an illegal kick, whereas he got a warning for something else.
When Daniel and Jessica are hanging off the side of the cliff being held hostage by Mike and his gang. Snake tells Daniel to give him the tree and Jessica, when telling Daniel not to, calls him "David" instead of "Daniel".
At the airport, the supposedly "Professional" soldier Capt. Kreese returns Terry Silvers' rigid and perfect salute with his thumb hanging out far enough to hang drapes from. A decidedly unprofessional salute.