Enter one of the following codes at the diner to unlock the corresponding selection in the "Extra Option" menu in the diner:

Option - Code
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