Dragon fights David while being handcuffed to Mandy during a chase scene. A similar thing happens in a fight scene where Toby fights Vic and his goons while being handcuffed to Malik.
During the fight scene with Dragon and Chow's Caucasian henchman, the henchman scrapes his sword on fences while running forward. This reflects the scene where Sato scrapes his sword on the concrete while riding the motorbike toward Charlie Vincent.