At one point in the film, Bruce and Linda are watching on television the premier of the pilot movie for the TV series Kung Fu. Bruce then gets a phone call informing him that his father is dead. Bruce goes to Hong Kong for his father's funeral and afterward is cast in the film The Big Boss. All of this took place between 1970 and 1971. However, the pilot film for Kung Fu was not premiered until 1972 and his father died in 1965 - just 6 days after Bruce's son Brandon was born.
Bruce Lee is seen watching Kung Fu (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.
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.
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.
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.
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.
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.
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).
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.
The ARRI camera has a single canister for both exposed and unexposed film. Tearing open the canister would immediately ruin enough film that it would most likely be written off as a total loss.Some may have been salvageable, but it would have been the stuff at the very center, and probably none of the film shot for that scene. Additionally, there is nothing that says "all" of the film was ruined, nor was there anything that stated that he targeted only the film just shot. "Film Crew from 1993" or not, the scene was 100% accurate for what would happen if someone took that camera, tore open the door, and blindly started pulling film out.