In the Octopus stage, you can shoot the crab for some bonus hit points. In any of the stuffed toy stages, you can repeatedly shoot the glass that shows your target and get many bonus hit points. In most of the criminal stages, you can shoot out the windows of cars or buildings and get many extra hit points. If you shoot out a window when a criminal pops up, you can also get more than 100% accuracy and get more points. In some of the protecting Dr. Don and Dr. Dan stages, you can shoot them and get hits for shooting them.
In quest mode, start a new game and go down until you see a raft. Run over it to get the map.