Revealing mistake: When Jackie falls from the helicopter, in the close-up of him falling towards the trees, you can see a wire coming from Jackie's' left; using slo-mo helps. (The use of slow motion is permitted if things such as crew or equipment are visible.)
Revealing mistake: When it shows the bad guy at the shooting range, there is a guy in a red shirt doing target practice right at the beginning of the shot. He is fake.
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