Bug: Go into 2 player mode, and let player 2 pull out the Katana. If player 2 turns on CJ and kills him with that sword in such a way that his head is cut off, he will respawn in 1 player mode with no head. Just a neck stub with blood constantly spurting out. You can walk around and continue on as headless CJ until the game is reset. All of CJ's spoken lines are cut off after just a couple sounds as well once this happens.
Other mistake: If you enter the police station in Dillimore (in Red County), the loading screen states you're entering "LSPD HQ", which isn't correct. LSPD HQ is in Los Santos, in Pershing Square. However, the two stations are identical in appearance, and the only major difference is Dillimore's police station has the "Country-style" cops while LSPD HQ has the "City-style" cops.
Bug: When attacking people in a restaurant, some of them that are sitting will slump over and 'die' with their heads on the table. Yet they are still alive in the game. But you can't lock on to them. You can't kill or hurt them ether. Blood splats, but nothing else. Punching, using melee weapons, shooting, using the chain saw, and even throwing grenades of other uses of explosives doesn't do a thing to them but splatter a little blood. Yet this supposedly 'dead' person will still talk to you if you bump them. Sometimes they'll still do the random compliment or insult and you can still have CJ respond to them.
Bug: Get in a jet and fly towards a corner of the map and keep going. Make sure the jet has autopilot leveling, and leave the control alone. Works better if the cheat for no hunger is activated. Fly off the map and keep going for hours (in game time), approx 12 or so. Then jump out and kill yourself to respawn back on land. This causes the whole map to be covered with Gang Territories.
Bug: One of the cheats for this game is called invisibility or infinite health, depending on where you read it, but it's the same code. However, after using this code, you are still hurt by explosions or fire (if not fire proof), and from falling. Also, if you happen to get hit by two bullets at the same time, it wounds you also, over loading the invincibility cheat.
Bug: Using the continual spawning glitch of civilians in restaurants, if you get to 3 stars, cops start spawning there too. Only they appear with their hands up or crouched in a surrendering position and they never fight you. When they appear, they speak threatening remarks to CJ, but never act.
Factual error: When changing clothes, CJ always does an animation where he inspects the clothing put on him, a different animation depending on where the clothes is. If you change his watch, he holds up his arm and rotates his wrist. But the watch does not rotate with it, despite a wrist rotation also rotating any person's full forearm.
Bug: If CJ stands right behind a chair in Pizza Stack, where he is touching the back of the chair as a person tries to sit in it, the person is partly blocked and can't sit down fully. They still get in the seated position, but are half hanging off the chair and levitating above it. If you move towards the person, it pushes them off the chair and then they stop, just levitating in a seated position beside it.
Bug: If you order food at a fast food restaurant, and then change weapons while CJ is going to the eating animation, it is quite comical. He uses his right hand to eat, which he holds his weapon with. So as he's eating, he also holds his weapon and food together, waving the weapon around and wiping his face. The funniest one is doing that with a chainsaw.
Bug: To start a Taxi mission, you must have an empty taxi, i.e. nobody else in with you. If you have one or more gang members in it, it tells you that. But you can trick the game. If you get in the taxi and press R3 (or whatever the XBox equivalent is) before the gang members get in, the taxi mission starts. And then the gang members get in and you can have them with you, shooting out at cops and enemy gangs as you do taxi missions. Watch out though, the passenger you pick up as Taxi fare will always get in a back seat. So have no more than 2 gang members with you, and be sure one is in the front passenger seat to leave one back seat open. Park with that open seat closest to the passenger you are picking up, other wise they'll force a gang member out and the other will get out also, and you've lost them for the taxi mission.
Bug: Sometimes, after the glitch happens where no chute comes out of your parachute, when CJ hits the ground, he dies, obviously. But then when the screen fades to black and comes back, CJ is dead yet again outside of the hospital with the Wasted screen happening and fading again to respawn. Meaning sometimes the glitch causes this glitch, that kills you twice. This is an especial pain in the ass if you don't have the girlfriend benefit to prevent weapons and money taken after a hospital visit, and if you have low money, getting charged twice.
Bug: A very annoying glitch that happens quite often is after bailing out of a plane with your parachute, you deploy it... Only the chute never comes out. CJ still goes through the motions as if it came out, and straightens out, raising his arms to hold the ropes. Only there are no ropes, and no chute. So you just fall to your death.
Other mistake: CJ can order his gang members to attack a cop, and the cop won't do anything, except sometimes run away. They can shoot at, hit, and knife the cops, with any retaliation being rare. But all CJ has to do during the attack is point a gun in the cop's direction and suddenly the cop is all about trying to bust or waste CJ.