Continuity mistake: When Axel elbows the guy in the face at the strip club you can see his elbow not even hitting the guy's face.
Continuity mistake: When the semi crashes into the fruit truck you see the impact, but the camera angle changes and you see the semi hitting the truck again.
Chosen answer: Much of Axel Foley's lines were improvised, including this scene, according to the commentary. But many other actors improvised their lines too, most notably Bronson Pinchot. The script was originally written with the intent of Sylvester Stallone playing Axel and as such, the issue of his race wasn't scripted and the director tried to avoid mentioning race in the film. It was Eddie Murphy that would bring it up in improvised lines.
Bishop73