On the title screen of the PlayStation version, holding any two of the four shoulder buttons (L1, L2, R1, R2) and using other controls can change the position of the flag. Use the D-Pad, Circle, and Square buttons to rotate, Triangle and X to zoom in and out respectively, and Start to make the flag see-through.
Contributed by MehDeletingLater
In the PlayStation version, at the beginning of any course, if you drive a short distance from the starting line, turn around and drive into the wall behind the starting line at speeds of roughly 60 MPH, a "mirrored" version of the track can be played, where left turns become right turns and vice versa, and the surroundings switch sides of the road.
Contributed by MehDeletingLater
In the PlayStation version, after unlocking the extra reversed tracks, a new opponent can be raced in Time Trial mode, the 13th Racing, the fastest car in the game. Upon beating the car in Time Trial mode, it is unlocked as an additional car.
Contributed by MehDeletingLater
In the PlayStation version, if you finish 1st Place in all four tracks, a set of four extra "reversed" versions of the tracks are unlocked as a reward.
Contributed by MehDeletingLater
In the PlayStation version, a Galaxian mini-game can be played as the game loads. If all the enemies are defeated before the game loads, 8 additional cars are unlocked as a reward.
Contributed by MehDeletingLater