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.
Deliberate mistake: When Jackie starts the rally car in the desert, he does not push in the clutch even though it is a standard transmission.
Other mistake: When Jackie and some people find a dead guy in a tree one of the villagers says something to Jackie. He not only understands this, he says something back to him. A few minutes later he is speaking the language also. After being their only a few days, Jackie knows their language.
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.
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