Continuity mistake: In season 2, when Johnny is telling Miguel about the birth of his son, Robby, Johnny says Robby was born in 2002 and that it happened shortly after the death of his mother, Laura. In a flashback during the final episode, however, we see Johnny visiting Laura's grave, and it says she died in 2007.
Revealing mistake: The scene where Johnny is assembling the baby's crib in his apartment while talking with Carmen; they share a hug as the camera pulls back, and you can just make out the outline of the pregnancy pillow the actress is wearing under her flowered dress.
Other mistake: During the Sekai Taikai tournament, all of the characters and extras wear new, pristine gis (karate uniforms) that never seem to get dirty. As they use their own gear, you would expect at least some wear and tear from previous use, or some marks from the fights, training, sweating, etc., to show occasionally, but the uniforms all seem brand-new all the time.
Suggested correction: It's not uncommon for competitors to bring multiple gis to a tournament; perhaps the participants were told to always have a fresh uniform for the cameras.
Even if they brought multiple gis, you would expect to see some wear and tear, or marks from previous contests. Also, several of the contestants are high school students from low- or middle-income families; they would not be able to afford buying several brand new uniforms for a single contest.
Maybe the tournament organisers supplied the uniforms?
Audio problem: When Tori and Kwon are talking in the hotel lobby, Tori says, "Maybe you shouldn't have let him kick your ass," but as she turns her head, her lips aren't moving.
