In the first level, if you shoot an oil cover on a car, the car explodes, killing anyone near it.
Level Five
Shoot out the pilot (that Way the plane ain't going nowhere) then wait till the boys are on the plane (so they don't run).
Level Four
Shoot at Don Caniole to scare him then when he's hidden under the table - Shoot out the chandelier so it drops on his head, he'll stand up rub his head then run.
Level One
Track Carlos and shoot out whoever he stops at instead of everyone.
Level Three
The dog on the sidewalk.
Level Two
The Five Brothers are the ones wearing sunglasses.
Explosions...