Enter the following codes at the diner to unlock the corresponding item in the "Extra Option" menu:
Invincibility: 4PR28U
Big Blasters: IG72X4
Classic Blasters: L449HD
Silly Blasters: NR37W1
Brushes: SHRUB1
Tea cups: PUCEAT
Minikit detector: LD116B
Moustaches: RP924W
Purple: YD77GC
Silhouettes: MS999Q