The Karate Kid/Trivia

The original film series has examples of:

 * Dawson Casting: Ralph Macchio was 21 when the first film was made, playing a 17 year old. He was 28 playing an 18 year old in the third film. Not many people noticed thanks to Macchio's boyish good looks and high-pitched voice, making this one of the few effective examples of the trope. Avoided in the reboot, as the kids are actual kids.
 * Hey It's That Guy: The black Cobra Kai student? It's Lamar Latrell. We shit you not. Karate Kid II had one line roles from such up-and-coming actors as SVU's B.D. Wong, and Clarence Gilyard of Walker: Texas Ranger and Matlock fame.
 * Throw It In: The song drunkenly sung by Mr. Miyagi was one he heard when he was a child. This even gets worked into the second movie as being Miyagi and Yukie's old song.
 * Trope Namers: Wax On Wax Off, and formerly "Sweep the Leg".
 * What Could Have Been: Chuck Norris was offered the role of Kreese, but he didn't want martial artists to be portrayed in a bad light (he would later play himself in Sidekicks, another movie with a Miyagi-like mentor and a Kreese-like villain). What's more, Toshiro Mifune reportedly auditioned for the role of Mr. Miyagi but was not fluent in English and would have had to learn all his lines phonetically.

The 2010 remake has examples of:

 * Hey, It's That Gal!: The female snake charmer is played by an uncredited Michelle Yeoh (?).
 * Name's the Same: Hehehehe. Master Li.
 * Bullshit, Mr Han-Man