Test Drive 2: The Duel was a competing product out at the same time as Vette, but didn't offer a 2-player option (the "duel" was between you and the computer. Vette attempted to boost sales by including a sticker on the front of the box that read:
Presenting The Real Duel
Unique 2-Player Option
Race against another driver via direct computer link
One of the few games to support EGA's 640x200 mode, which it used to display static scenes in fine detail over what EGA's 320x200 mode would allow.
During the development of this game, the large-scale communist attack on protesting Chinese students in Tian An Men Square occured. In memory of that event, one of the programmers snuck this string into the program executable:
IN MEMORY OF THOSE WHO WERE MURDERED IN TIAN AN MEN SQUARE ON JUNE 4, 1989. J.P.
There is a hidden area in the map: Select course 3 (starting on the Bay Bridge), then turn around and go backwards for a ways (with the wall on your left, the ocean on your right, and traffic coming at you). After you've gone far enough, you will suddenly be in a nicely-detailed area whose streets are named after the developers.