Crash opening song:
Press Select before the opening song ends to stop it on the final note. Press Reset to resume.

Cycle sprite data:
Press Select when a girder falls. Sprite data will cycle at the girder's location. This also happens when Select is pressed when the evil doctor drops items.

Broken eggs:
Press Select when the eagle drops eggs.

Pause game play:
Press Select while climbing or hanging. Press Reset to continue. This also will temporarily pause the game if Select is pressed while falling.