Josh is told that a "little Korean man" used karate on him. Karate is a Japanese martial art. In Korea, Taekwondo as a martial art is hugely popular.
The title of this episode is "Black Belt." However, the use of the black belt as a rank and title did not begin in Japan until the early 20th Century.
However, the use of Black Belt as the title of a 1958 TV Western is not a Goof.
However, the use of Black Belt as the title of a 1958 TV Western is not a Goof.