Audio problem: When Axel is first arrested you hear Axel talking to the police officers as they pull up to the station and you hear the police officer talking back to him as he gets out of the car but none of their lips are moving.
Audio problem: Taggart and Rosewood try to pursue Foley from the hotel but their car stalls from the "banana in the tailpipe", and when Rosewood tries to restart it, it makes the starting sound of an older Chrysler, when the car is actually a Mercury.
Audio problem: Zack walks up to Axel after Maitland and his men show up at the warehouse where Axel and Jenny find the cocaine in the coffee crate, and says "I should've taken care of you in Detroit, when I popped your little buddy." When he says "buddy", it's an over-the-shoulder shot of Zack from behind. His mouth doesn't move.
Audio problem: In the bonding warehouse, there is no sound from Jenny's shoes when she is running, but when outside, you can hear her footsteps.
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