Tennis no Oji-Sama: Smash Hit!

Bandaged Echizen:
Highlight Echizen at the character select screen, then hold L2 and press Circle.

Right-handed Echizen:
Highlight Echizen at the character select screen, then hold R2 and press Circle.

High Tension mode:
Highlight the "Practice Mode" option at the main menu. Hold Select while choosing that option. A sound will confirm correct code entry. The character's special bar will recharge faster in High Tension mode.
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Pairs mode ending sequence:
Highlight the "Pairs Mode" option at the main menu. Hold Select while choosing that opion. A sound will confirm correct code entry.

Bonus gallery picture:
Complete the Gallery by getting everyone's Service Ace or Smash Ace, Game Win, and Countered picture. Note: Seigaku has a bonus picture that is unlocked by by completing Episode mode. You will then unlock a picture with all characters.