During the finale when Jason arrives at the airport, he's wearing a long coat, but in the next shot, he's wearing a short one.
At approximately 57m into the film, when Superintendent Wong walks in during the interrogation of Siu-Wong Fan's character, the English-language part of the police wall calendar shows "26 Jun Fri". The two characters then go into a different room for a brief scene. When they walk out again, the calendar has progressed to "28 Jun Mon" (an inconsistent progression of two numerical dates and of three named days of the week).
In the mahjong parlor where an early fight scene takes place, the English-language date on a wall calendar reads "Jan 25 Sat". In the next scene in the police station - which is supposed to take place immediately afterwards - a wall calendar at the station shows "2 Jun Fri".
When Cynthia Rothrock's character enters the dead criminal's house and points a gun at Yuen Biao's character, the position of Rothrock's sleeve on her arm changes position between shots. In some shots her sleeve is pulled up near her elbow; in others, it's down near her wrist.
After leaving Cindy handcuffed to a balcony rail Hsia jumps off to the "grass" below. The ground bends under his weight.
During Cindy Si's first fight in the mahjong school, it is very obvious when Yuen Biao is doubling for some of her stunts particularly because of his dark hair.
When Siu-Wong Fan's character is assassinated, members of the production crew are seen reflected in his sunglasses.
A swinging kick by Cindy on the balcony railing is performed on a table beside it.