Abusable Bug: When you''re in jail, the timer goes down by two seconds. Killing yourself about three times will make it go down by three seconds. This is abusable because it allows you to get out of jail quicker without serving your full sentence. If you have a one hundred second jail time, by default, it will only take sixty seconds to get out of jail, if you kill yourself a few times, it will take fourty seconds to get out of jail.
Sometimes the server scripts will break. Nothing that has been coded will work. The hud, menu, plants, robbing, using bankers, or anything won't work. Bots will start spawning in also. The game also returns to its normal gun mechanics will one shot headshots and stuff.
Abusable bug: If no one is a cop, then anyone who joins will become a cop as long as there isn't any cop. This is abusable because people can rejoin to become cop when they're not supposed to.