Other mistake: In the beginning of the film, when they are showing Dre's "growth chart", it shows about 2.5 inches of growth between April 2003 and May 2003, which is not possible. And no, there is nothing in the movie that indicates he has some sort of abnormal condition that causes rapid growth.
The Karate Kid (2010)
1 other mistake
Directed by: Harald Zwart
Starring: Jackie Chan, Taraji P. Henson, Jaden Smith, Wenwen Han
Continuity mistake: When the karate kid first goes to Mr Han's house to train, he drops his jacket by the doorway. Later on as they are talking, you can see his jacket move to different spots on the ground between shots.
Dre Parker: Mr. Han... Do you know you got a car in your living room?
Trivia: Whilst this movie is a remake of the 80's Karate Kid, and is named the same, no actual karate is performed at all. It's all kung-fu.
Question: Why did Cheng present the trophy to Dre and why did they all bow to Mr. Han?
Answer: Because Dre has finally earned Chengs respect. The other Fighting Dragons bowed to Mr. Han because in China bowing is shown as a sign of respect as they see that he is a better teacher and a kinder master then Master Li.
Since this movie mirrors the 1984 original movie, this is like how Johnny Lawrence (William Zabka) and the Cobra Kai's (excluding Dutch [Chad McQueen]) finally respect Daniel Larusso (Ralph Macchio), after the latter defeats Lawrence-The only difference is that the Cobras do not bow to Mr. Miyagi.