Factual errors: As with most biopics, some historical details have been altered for the sake of the narrative.
Factual errors: Bruce Lee was already running his own kung-fu school (in Seattle) when he met his wife-to-be; he did not open this school at her suggestion, as the film indicates.
Factual errors:Bruce Lee hurt his back lifting weights, not in a fight. The fight scene is an distortion of a true-life fight in Lee's school.
Factual errors: The Tao of Jeet Kune Do was published in 1979 after Lee's death. He did not get it in the mail like he did in the movie.
Factual errors: The name of the restaurant where Bruce Lee worked was "Ruby Chow's" in Seattle, Washington, not "Gussier Yang's" in the San Francisco, California area.
Factual errors:Raymond Chow was the man who discovered Lee.
Factual errors: Lee did not even fight at the Karate tournament, he merely did an exhibition.
Crew or equipment visible: When Lee fights the man in the ice factory and does a high-jumping roundhouse kick, you can see the stunt wire connected to his back as he comes back down.
Factual errors: The British sailors wear American-style uniforms.
Factual errors: William Dozier was the producer of the Green Hornet not Bill Krieger. Dozier was introduced to Lee through a recommendation from Jay Sebring the hairstylist, not at a tournament as the movie suggests.
Factual errors: Although Bruce Lee did not injure his back during a fight to decide whether he could teach all races martial arts (he injured it doing Good Mornings, an exercise that places the barbell on your shoulders and lean forward until your torso is 90 degrees with your legs, then repeat) the fight did take place and he did win.
Factual errors: Bruce Lee began his martial arts training at the age of 13 after being beaten up by a street gang. He did not begin martial arts training at an earlier age because of a nightmare as the movie suggests.
Factual errors: Bruce Lee did not create his famous "battle cries" until he worked on _Jing Wu Men (1972)_. However, the film shows Bruce performing his battle cries when he was a child and every moment on.
Factual errors: The scene that is supposed to be filmed on the set of Tang Shan da Xiong originally involved the foremen and all of the workers at the factory when the bus arrives. However, in the reenactment in Dragon, only Bruce is present with no one else around.
Factual errors: In the "Enter the Dragon" (room of mirrors) scene, all of the mirrors are intact. In the actual Enter the Dragon (1973), one of them is broken and has a spear stuck though it.
Anachronisms: Bruce Lee is seen watching "Kung Fu" (1972) (which was conceived by and for him but the main character given to David Carradine instead) sometime between 1967 when "The Green Hornet" goes off the air and 1970 when he makes his first movie in Hong Kong.
Factual errors: Throughout the movie Bruce spends plenty of time doing back flips and somersaults in his fight scenes, however the real Bruce Lee's fighting style was very grounded and direct, focusing more on effective hits than on fancy movements.
Factual errors: Key dates in the movie are depicted at the bottom of the scene. Many of these are incorrect. Lee came to the United States in 1958, at the age of eighteen. In the movie it is dated 1961.
Boom mic visible: In the nightmare sequence at the martial arts school, a slightly low-angled two-shot of Lee and the armoured warrior shows a large boom mic dangling through the mist above their heads.
Factual errors: When Bruce and Linda are at the October 1971 Hong Kong premiere of 'Big Boss', the wrong version is playing. It was the Mandarin-language print (with English/Chinese subtitles, no credits and finishing with 'The End') that played. In the film, it's the 'National General Pictures' version which was created in 1973, two years after the HK premiere (evidence of this is the English credits and soundtrack).
Continuity: During the fight in the alley outside the restaurant, when Bruce and the two workers are fighting on the iron girders, the girders are suddenly much closer to the ground when the workers are kicked off by Bruce.
Continuity: During the fight outside the restaurant with butcher knives, Bruce throws one of the knives at an opponent. When the knife is shown sticking into the wall it is now a standard triangular shaped knife.
Revealing mistakes: During the ice house fight scene while filming "The Big Boss", it is easy to see that the circular ice saw is much thicker than an actual saw blade and lacks teeth.
Revealing mistakes: When Bruce punches the first block of ice thrown at him in Thailand, you can see an enclosed explosive charge detonate just before the block shatters.
Crew or equipment visible: During the ice house fight scene while filming "The Big Boss", after Bruce punches the ice blocks, he and Luke Sun grapple and Bruce gets thrown by Luke into some boxes - during this, the support wire is visible on Bruce's back.