The Karate Kid (1984) made $90.8 million. The Karate Kid Part II (1986) grossed $115.1 million. The Karate Kid Part III (1989) earned $38.9 million. The studio was keen to continue the franchise, though this film's $8.9 million take effectively killed the prospects of any further films. The 2010 remake took in $171.8 million at the box office.
Daniel Larusso, the protagonist of the first 3 films, does not appear in the film. It is presumed that he went away to college. After Mr Miyagi walks in on Julie hwhile she's changing clothes, he says he "used to live with boy...Daniel-san." Macchio was 33 years old, too old to reprise his role as a "Karate Kid." He publicly stated that he was "not interested in becoming the Sylvester Stallone of Karate Kid movies."
The Kata Hilary Swank performs in the monk's hall and under the waterfall appears to be a portion of the first kata (form), "Naihanchi Shodan". This kata, historically of Chinese origin, is common in Okinawan and Japanese karate as well as Tang Soo Do, (a Korean art) practiced by the film's martial arts choreographer, Pat E. Johnson. Miyagi-San identifies his style only as "Okinawan Karate", but that could be any of the Okinawan styles that share this form. Since in The Karate Kid Part II (1986) Miyagi's nemesis runs a school in Naha with the Goju Ryu fist as a logo and his students wear the Goju Ryu fist on their uniforms, then Miyagi is possibly teaching Goju Ryu (one of the five main styles of Okinawan karate), since Miyagi's father taught both him and Sato.
This is the only film in the series in which Mr. Miyagi does not appear in the final frame of the movie before the credits begin. However, he does appear in the last frame of the scene that transitions into the scene the credits play over.
The song, "Fascination," that Miyagi turns on when he is teaching Julie to dance is the same song that Johnny and Ali dance to at the country club in the original The Karate Kid (1984) and is playing on the radio in the car that picks up Daniel and Mr. Miyagi when they first arrive in Okinawa in The Karate Kid Part II (1986).
In 2010, The Karate Kid (1984) was rebooted as The Karate Kid (2010). Jaden Smith played new character Dre Parker and Jackie Chan played his mentor, Mr. Han. The reboot had mixed reviews, making $18.8 million in its opening weekend and grossing $176.7 million in the US. In 2010 Columbia Pictures began developing a sequel. In April 2014, Breck Eisner was announced to direct and Smith and Chan were confirmed to return. O June 25th 2014, Jeremiah Friedman and Nick Palmer were announced to write the sequel. The movie didn't get past early production stage.