Lotus 72E car
If you want to unlock the Lotus 72E car win a season in simulation mode.

Williams FW14B car
If you want to unlock the Williams FW14B car win a race in arcade mode.

Alternate introduction sequence
Get an entry in the top 10 lap times in time attack mode to unlock an alternate introduction sequence.

Control car preview
You can use the Analog-sticks to turn the wheels as you are previewing a car.

All cars
If you want to unlock all cars use "RETROF1" as a name.

Jordan 191 car
Win a season in Arcade Mode to unlock the Jordan 191 car.

Renault RE20 car
If you want to unlock the Renault RE20 car,win the championship in career mode.