Rails + Pitons + Pulley + Pipe + Salt - S5-E9
Factual error: Mac's "cutting torch" was supposed to weaken the lock, and the pressure difference would do the rest, since there was "no air in the room." However, the door swings outward. If there is no air in the room, the higher pressure outside the room would keep the door closed, working against him, rather than for him. Besides this, the arc from a 12v car battery is unlikely to considerably weaken a steel lock. (00:01:15)
Rails + Pitons + Pulley + Pipe + Salt - S5-E9
Factual error: MacGyver is using an improvised cutting torch to weaken a lock on a door. When he thinks he has cut enough he drops the torch and immediately holds on to the lock to open it. If It has been subject to a cutting torch long enough to weaken it, he would not be able to grasp the lock with his bare hands without seriously burning them. (00:15:00)
Rails + Pitons + Pulley + Pipe + Salt - S5-E9
Factual error: Every time the Phoenix Foundation airplane is shown, it has absolutely no markings. Every aircraft has to be registered somewhere and display its registration prominently, and no aircraft can fly in a country's airspace without a registration number at the very least. (00:01:55)
