Rather than having to deal with cops or soldiers when you destory cars in the game, you can use this glitch to "turn them off" until after you switch back to Spider-man. Destroy a car, however you choose, then when the score number appears press start. Select Unlockables and press X. It will ask if you want to quit the current mission to view the unlockables. Agree to this, then simply resume the game after quitting the mission. Now you can destroy all the cars and people you want without any enemies showing up.