You find bullets and ammunition in the most innopropreate places like under a bed, or in the bathroom of a mansion.

Dimensions are always messed up, the outside of a building is always smaller then the inside, this also goes with the heroes ability to carry 100 bombs, 100 missles, 100 arrows, 1 giant bazooka, and a large broadsword twice the length of the hero all on his/her pockets.