The James Bond theme was originally sought after and programmed into the prototype machine until it was determined that licensing costs for this music would be too expensive. A person from marketing suggested they use the Peter Gunn theme instead.
A third Spy Hunter chase sequence, a helicopter chase, was deleted from the game due to lack of time and memory.
The car in Spy Hunter, the G-6155 CIA prototype Interceptor, was modeled after a 1983 Z-28, the car that George Gomez owned at the time. The numbers stand for designer George Gomez's birthday (6155).