Continuity mistake: When the white car is stuck and the stones are flying, the window of a car behind the white car is smashed, however in the next shot, it's back to normal and is smashed again. (00:51:45)
Continuity mistake: At the end of the bridge scene, Jackie is talking to the CIA operative. She asks him if he has the disc. At this point his hair covers only part of his forehead. When he chucks the disc into the river, his hair fully covers his forehead. (01:40:05)
Continuity mistake: When they are driving away in the white car they go on their side and drive around and then get flipped back up and there is no damage to the car whatsoever.
Continuity mistake: When the "smart" scientists are at the power plant one of them picks up a CB backwards and talks into it.
Continuity mistake: When the car is driven through the narrow alleyway, along the side of the car it is all dirty and scratched. But when they right themselves and drive off, there is no dirt or scratches.
Continuity mistake: When Jackie and the reporter Christine are in the restaurant in Roterdam, he just found out that she tapped his phone call. She pulled her hair back to show him her earpiece - the next shot her hair is down. In the very next shot she's holding her hair back again.
Continuity mistake: In the scene where Chan is handcuffed and fighting he falls on his back and kicks a bad guy but his hands are free, then in the next shot the handcuffs are back on.
Continuity mistake: During the fight on the roof at the end of the movie, at one point, Jackie is standing on the edge of the roof, and the camera is above him. There is a view of a car park at ground level, with cars in it. There is then a brief cut away, and, in the next shot, the car park is empty.
Continuity mistake: When Chan is fighting the two guys on the roof towards the end, the sky starts off very cloudy but throughout the battle the clouds keep changing. At one stage the sky is totaly clear but in the following shot the clouds are back.
Continuity mistake: During the scene with the wooden shoes, Jackie throws a shoe and hits one of the guys in the face. The shoe hit on the left side of his face, but he holds the right side of his face.
Continuity mistake: After Chan fights the two guys on the roof he jumps off and slides down a slope of windows. When he jumps onto the glass he lands about 5 rows down the slide but in the next shot he begins sliding down from the top row.
Continuity mistake: When Jackie infiltrates the building in Rotterdam, he changes from his street clothes to that of a coffee server. Later, when he is about to get into a fight on the rooftop, he is wearing his street clothes again. He didn't have enough time to change as he was being chased.
Answer: It's quite possible because most movies use dubbing (or "looping") as part of the post-production work to enhance the quality or fix minor sound problems. Sometimes a different actor's voice is dubbed over a minor on-screen character.
raywest