Karl Mak, the producer, gave four million HK dollars to Lam towards the film's budget, giving Lam absolute freedom to make any genre of film he wanted.
The stunt scene which when Ko Chow tried to escape from the police and jumped from second floor to the eave on the first floor, then down to the ground was acted by Chow Yun-fat himself. A stuntman had done a dry run for Chow before shooting while the director arranged to put some tatami and paper-boxes on the eave to protect Chow. The director hid the safety set-up through shooting the scene from a particular angle.
The scene which Ko Chow is running on Nathan Road so as to escape from the police was filmed when director Ringo Lam put the camera in a van and ordered Chow Yun-Fat to follow the van that is driving along the road.
Hong Kong film director Ringo Lam saw the Indian film Gaddaar (Vinod Khanna), years ago. He took the basic idea of the plot and made "City On Fire". Quentin Tarantino' saw that film and was inspired to make Reservoir Dogs. Sanjay Gupta decided to make his own version with Kaante.