Like at Coyote Creek, Eli greets Miguel saying "finally a worthy opponent". They also do their fist bump before the fight.
Demetri did not compete in the All-Valley Karate Tournament in season 1, he only started practicing Karate in season 2, when Miyagi-Do offered free lessons, so the entire All-Valley Karate Tournament sequence in season 4 was intense for him. "That was, just because we would have to wear the same gi and oftentimes stand in the same place," Gianni DeCenzo said. "So it would be confusing like okay, wait. What episode are we filming? What day is this? What's the scene? But yeah, that was a lot of fun. Getting to fight Robby and especially doing the kamas, that right there."
Jon Hurwitz spoke of Carrie Underwood's presence on set saying, "Carrie was absolutely amazing on set. It was a joy having her join us and seeing her get just as starstruck by our cast as they were by her!". He added that they knew Carrie was a big fan of the series, alongside her family, since her original tweet praising the series when it hit Netflix. They "figured we'd shoot for the moon and see if she'd like to come and play." They needed a well-known singer who could cover Survivor's 'Moment of Truth' (which was the end credit song from the original Karate Kid movie) and simultaneously shock the All Valley crowd by simply appearing. Carrie's team immediately responded by saying she would love to appear.
Carrie Underwood singing Survivor's Moment of Truth means that she would be aware of the actual fictional movie The Karate Kid within this show's (and based upon this shows) fictional universe, since that song is in the original movie. It would be like the detention students in The Breakfast Club singing Don't You (Forget About Me) by The Simple Minds, in detention.
Carrie Underwood: wasn't just a dream for fans, but for Carrie too, since it's one of her favorite shows. "I grew up watching 'Daniel' and 'Johnny' and I can't believe I actually get to be a small part of the legacy that is the Karate Kid." She tweeted about her adoration for the series in 2020, which caught the attention of creators Josh Heald, Jon Hurwitz, and Hayden Schlossberg. They weren't sure it would come together to have her singing in the All Valley, but it was a "match made in heaven". They didn't use the song 'They're The Best' that played during the 1984 film in the All Valley Karate Tournament, as they felt it would be a copycat of the movie. The chose 'The Moment of Truth' because it "still has that same 1980s sports-rock anthem vibe".