Crazy ball:
Press C, A, B, C(2), B, A, C at the options screen.

Curve ball:
Press B, A, C, B, C(2) at the options screen.

Dream team:
Press A(2), B(2), C(2), A(2) at the options screen.

Invisible walls:
Press C(3), B, A(3), B at the options screen.

Super offense:
Press A(5), B, C at the options screen.

Super defense:
Press B(5), C, B at the options screen.

Super goalie:
Press A(5), B(5) at the options screen.

Super power:
Press B, A, B(8) at the options screen.

Bonus FMV sequences:
Enter the "Coaching/Stats" screen. Highlight the "Formations", "Coverage", or "Strategy" options and press A to view a hidden FMV sequence for each of those options.