Reset Hall of Fame - Press Right, B, and Select simultaneously at the Hall of Fame.

Reset Saved Games - At the first of the copyright screens, press and hold A, B, Right, and Select briefly.

Keep the crew happy for a long time {glitch} - At the age of 40 {use the 'search' command to make time go faster} the game will glitch and your crew will always be happy; no matter how many men sign up. After a few years though the effects of this glitch will wear off.