Some cheat codes (enter during gameplay):

"CINDY CRAWFORD" - ?
"MEXICAN BEANS" - Refills weapon availability
"MORE LAUGHTS YOU CAN SHAKE A STICK AT" - ?
"EXTRA LIFE" - Extra life

A sound effect confirms successful entry. In some levels certain cheats cannot be activated (factors unknown). Entering multiple cheats in a row or the same cheat multiple times is also not possible in some levels.