When Kit first introduces Jackie to his brother at the hospital, she accidentally cuts the flowers off their stems and puts them in the vase. In the next shot, the flowers are back in the vase fully intact.
Mark is beaten almost to death and his face is completely covered in cuts and bruises. The next day when he and Ho blackmail Shing, he has no bruises or cuts and just a small bandage on the side of his face.
When Mark shoots up a restaurant, one of the gunmen gets shot in the corridor - blood splattering onto the wall behind him as he falls back and knocks down a picture. In subsequent shots, the goon's splattered blood is absent and the picture is hanging properly.
The cello playing at the "audition" (c.11 minutes) is inaccurately mimed.
The cameraman can be seen in the reflection of the characters' sunglasses.