Control demonstration mode:
Hold R or L at the title screen and reset the SNES. Use the D-pad to control the direction of the baseball when the credits begin.

Bonus ending sequence:
Get a 100% ranking for a bonus ending sequence.

Super curveball:
Hold L until the ball is released, then hold R.

Lobbed pitch:
Wait until a pitcher becomes tired, then hold Down during an entire pitch.

Pitches:
Use the following moves for a right-handed pitcher to throw the corresponding pitch.

High fastball: Press Up, B, then hold Up.
Low fastball: Press Down, B, then hold Up.
Straight fastball: Press B, then hold Up.
High change-up: Press Up, B, then hold Down.
Low change-up: Press Down, B, then hold Down.
Straight change-up: Press B, then hold Down.
Splitter: Press Right, B, then hold Up/Left.
Slider: Press Right, B, then hold Left.
Curveball: Press Right, B, then hold Down/Left.
Hard screwball: Press Left, B, then press Up/Right.
Screwball: Press Left, B, then hold Right.
Slow screwball: Press Left, B, then hold Down/Right.