Yea, RX-3s were cool. In my Drivers Ed class, we use a simulator set up(too cheap to have actual cars, or new simulators for that matter)with a projection screen, and it shows a driver's veiw and there are about 20 "cars" in the room, consisting of a car seat, a steering wheel, a shifter, and a speedometer and stuff. We are supposed to go along with the film, although it's so unrealistic it's not worth it. Anyhoo this film is from like '81 or so, in it I've seen a '79 RX-7, Several RX-3s, RX-4s, RX-5s, and other cars(non-Mazda) which is pretty cool to see them new.
Becides the RX-3, I'd say the 323 GTX and GTR, MX-3 GS, and all of the Eunos cars in Europe and stuff. Cool cars.