Random Name  Start a game as usual and select end without typing anything. (Thanks to Myau84@aol.com)

Ski On Your Head  In Olympic Mode, select freestyle aerials and any trick. Don't press anything when you're going down the hill. After you've left the ramp, press B repeatedly.

Special Ending  Get a medal in every event. Then, press Up, Up, Down, Down, <, >, <, >, B, A at the awards screen. (Thanks to LWargalla@t-online.de)