Contributed by: Albert Valentin
The film was Corey Yuen's Hollywood debut, even though it was financed by Hong Kong film company Seasonal Films. Corey Yuen got frustrated when Kurt McKinney couldn't hit the bag with his foot with his other leg tied up. Corey showed Kurt how to execute the move and Kurt was then able to perform the move. The martial arts choreographer "Harrison Mang" is Hong Kong stuntman/actor Mang Hoi, who collaborated with Yuen on a series of old kung fu films.
The original title in Europe was 'Karate Tiger'
Contributed by: Patrick And Tony G
You mention that Kim Tai Chung (the korean actor playing Bruce Lee) was actually a double for Bruce in his films. This is only partially true as they never met. He played the role vacated by Bruce after his death "Game of Death", and years later played the character of Lee's brother in Game of Death. He then went on under the name Bruce Li in films such as Fist of Fury 2.
Contributed by: Tony Ryan
Bruce Lee's actual "double" in his own films was Yuen Wah, a former student from the same school as Jackie Chan, Sammo Hung, and ironically the director of No Retreat No Surrender (Cory Yuen Kuei)
Favorite line: "Nice Dojo... I'll probably join."