You can unlock the Gold and Silver drivers, the Gallery, the credits, and the bonus track without changing the Williams driver's name. If you meet these criteria, they will be saved to the game pak and can never be erased. Here's how:

To unlock both the gallery and the credits, finish in first place in ''Grand Prix'' mode on Rookie difficulty. They will be accessible on the title screen below ''Start''.

To unlock the Bonus Track (in Hawaii), finish in first place in ''Grand Prix'' mode on Professional difficulty. It can be raced in Exhibition, Time Trial, or 2 player mode.

To unlock the Silver Driver and Gold Driver respectively, score 80% to unlock the Silver Driver and 90% to unlock the Gold Driver (eg after you score 90%, you will unlock Team Extreme). The drivers are only available in Exhibition, Time Trial, and 2 player mode once you unlock them. Warning: the speed is incredible (300+ MPH).