Ralph Macchio pushed hard to have a line in this movie that says, "Anytime I have the chance to spread a piece of his legacy, it's never the wrong choice,'" Macchio told HuffPost in an interview. "It's always paramount that Miyagi is woven into the fabric of Daniel LaRusso. Reprising this role means paying that legacy forward," Macchio added. "It's about spreading that wisdom and knowledge in a good way, in a positive way."
Ralph Macchio was 63 at the time of this film's release, 12 years older than Pat Morita was when El Karate Kid (1984) was released.
Jackie Chan performed a good amount of his own action scenes and was only doubled for complicated moments.
Jackie Chan, didn't need any training for this new entry, explaining: "I don't need to anymore. I've been training every day for 64 years. I've been fighting, fighting, fighting."
As this movie is set after the events in Cobra Kai (2018), the film's original release date was pushed back by five months, to accommodate for the Cobra Kai series finale's release.