Kyra Sedgwick, Kevin Bacon's wife, is the voice of the dispatcher.
The licence plate of the cop car, 149 PCE, is the same as David Mann's Plymouth Valiant in Duel (1971).
The piano part in the score was actually done by a thirteen year old boy, who's the composer's (Phil Mossman) son (Lucas Mossman).
The license plate on the cop car is a Colorado government plate. The county on the side of the cop car is a city found in Texas, located in Hunt County. There is no Quinlan County listed in Colorado, or any other state. According to Kevin Bacon, this city is supposed to be set in Fountain, CO, just south of Colorado Springs and a part of El Paso County.
The bottle on the hood of the cop car at 12:22 into the movie is not a beer bottle but is actually a bottle of Rocky Mountain Soda Co's Root Beer. Although the full label is not shown, you can see the ram tracks and plants on the side as well as part of the label that reads "All Natural".