To see the game ending, press and hold Up, A, B, Select, Start and press Reset. If done right, you'll see the ending.
Reset Battery RAM
Press and hold the A and B buttons on controller 2 and press Reset.
Select 'Course' Course
During a World Championship, highlight the "LAP" menu option, hold Right + B on Controller 2, then press A on Controller 1 to select the Machine, which is not available during normal games.
Select 'Machine' Course
During a World Championship, highlight the "LAP" menu option, hold Up + A on Controller 2, then press A on Controller 1 to select the Machine, which is not available during normal games.
Skip Race
During gameplay, press Down + Select on Controller 1. This ends the current race with worst results, though... However, if you hold A + B on Controller 2 during the qualifying race, you will complete it with the best result ever: 00:00:00. But you can't get this best result during regular championship races.
Ending...