Nagano Winter Olympics'98
Special Ending
Get a medal in every event. Then go to the Awards screen and press Up, Up, Down, Down, Left, Right, Left, Right, B, A.
Credit Goes To: Niklas Erdefelt via N64cc

 Special Ending
 Players Ski On Thier

Players Ski On Thier Heads
In Nagano Winter Olympics You can ski on your head! All you have to do is go to Olympic mode and select Freestyle Aeriels. Then pick any trick. As you go down the hill don't press any button. Wait until you have left the ramp then rapidly tap the B button. If you land your skier will then jump forward and land on his head and continue to ski down the hill with his head in the snow.
Credit Goes To: Nick via N64cc