- Towards the end of the filming, director Ronny Yu injured his cervical spine because he accidentally fell down. The doctor suggested that he stay in bed, but he insisted on staying on the set, wearing a thick neck guard on his neck.
- At the beginning, there were no lotuses in the shooting location of the lotus pond. The crew airlifted more than 200 lotus plants from Hangzhou to Shanghai.
- Jet Li canceled some martial arts moves designed by Yuan Heping, because some of the moves were disrespectful to Western actors.
- The Japanese actor Shido Nakamura does not speak Chinese. For the needs of the performance, he hired a Chinese teacher, and the director told him to imitate. He also tried to watch Chinese TV on Shanghai TV, but the crew later discovered that he was watching a Cantonese program.
- When Anthony De Longis and Jet Li took the first shot, they were NG three times because the sword could not stand the internal force of the two . Six swords were broken during the entire fencing shot. On the second day of the filming, Anthony De Longis presented a real Spanish sword to Jet Li.
- Brandon Rhea) section of the screen when shooting fainted because he was wearing clothes too tight.
- In order to stay in shape, Nathan Jones had to eat 6 meals a day during the filming. He could drink 1 liter of water in one sip and could do 150 push-ups in one breath.
- Nathan Jones accidentally fell during the filming and nearly lost a few teeth, but he refused to seek medical treatment to continue the filming. The other staff members were also deeply infected by him, and they were still working with injured ribs.
- Due to Nathan Jones' tall stature, he had to put three beds together while resting in a Chinese hotel.
- Sun Li is very afraid of leeches in the paddy field. At first, she wrapped cellophane on her feet, but the director did not allow her to do so.
- Michelle Yeoh’s scenes in the film were cut because the film was cut from the first 120 minutes to 106 minutes
- Shang Gedi has always been known for his quick and ruthless shots. He accidentally punched the martial artist in the abdomen when he tried his move. The pain caused the opponent to be unable to speak for a long time .
- Shang Gedi's first shot was to fight Jet Li repeatedly, but he was hesitant when shooting, NG many times, martial arts instructor Yuan Heping approached and asked. It turned out that Shang Gedi was afraid that he would injure Jet Li, so he had some worries when he shot .
- Brando once proposed to shoot with a spear that is really equipped with a sharp spearhead. He demonstrated the power of the spear on the spot. The staff held a large stack of newspapers three meters away from him. As a result, Brando pierced the newspaper with the spear as soon as he shot it. Yuan Heping was amazed when he saw it.
- In the climax of the film, Fearless wipes the smudges on his cheeks with his sleeves, but in subsequent shots, the sleeves are spotless .
Fearless behind the scenes gags
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Moon: because, "If you're sad", my Grandma told me "then cry", "After you cry, you still have to live life"
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Huo Yuan Jia: Poison works very quickly. It has worked its way to my heart... Zhensheng, promise me you won't seek revenge. Revenge will only bring us more bloodshed. Please, that's not what I want. We must strive to become triumphant... Nong Jinsun, I only understand wushu. I practiced for many years to understand what Wushu is, what is wushu's real purpose. The competition must continue. One cannot choose how one's life begins. It takes courage to finish the final step.