Continuity mistake: During the fight with the street gang, Jackie Chan is about to jump onto the cloth roof to send a gang member flying away. Watch the first half of the shot (from behind Chan) and the cloth in the section Chan is about to jump into is hanging down in the space between the joists and is very slack. When the shot changes from the front to show Chan jumping and landing into the cloth, the cloth is now stretched tight for his landing.
Continuity mistake: When Chon Wang is spinning the wheel back and forth causing Roy to be dunked into the water again and again, in one shot, the timing of Wang turning the wheel doesn't match up with Roy actually dunking into the water. It is the shot where it happens several times, timed to match the music in the background.
Continuity mistake: In the final fight, we see Rathbone flip his sword at one point so he is holding it "properly", but in the previous cut he was already holding it in the right way. This is because much of the fight was cut in editing, and several pieces of sword fighting were taken out.
Continuity mistake: When John is trying to lift Roy out of the water it seems to take a full rotation of the turnstile to raise him up a foot above the water, but when John is fighting with the guard he moves the turnstile back and forth about 2-3 feet each way and you see Roy dipping in the water and raising out about a foot above the water then back in and out of the water.
Continuity mistake: During the climatic fight scene between Jackie and the baddie in the Clock Tower, the background was the inner side of the clock. There was silhouette of the clock's hand without Owen on it when Jackie was dueling the villain on the platform. However, when Jackie and the villain crashed through the same clock face, Owen was hanging on the clock's hand.
Continuity mistake: At the end of the library fight scene, a guard is trapped in a rung on a ladder, leant backwards against the bookcase (so the guard is "on his back", head facing the books). Between shots, the amount of his body trapped in the rung changes, going from his shoulders, to most of his arms. It keeps changing between shots.