Visible crew/equipment: When Wez rips the door off the tanker you can see a crouched crew member next to Max. This has been disputed but it is there, watch underneath the steering wheel just after Wez starts shouting "Go! Go! Go!". (01:19:05)
Revealing mistake: When the tanker crashes at the end the driver is clearly wearing a crash helmet.
Continuity mistake: After his crash, Max is hiding behind a rock. He draws his shotgun out, and you can see he has no glove on his right hand. Then the interceptor explodes, and he shields his face with his right hand, which now has a glove on it.
Continuity mistake: When Max sneaks up on the raider who's sitting at the wrecked dune buggy with the dying woman and man, look at the crossbow on the ground. At first it's unloaded. Then when the raider sees Max, he reaches for it and it's suddenly loaded and ready to fire.
Continuity mistake: When Max's interceptor rolls down the hill, on its last roll you can see one of the fuel doors pop open (which should actually set off the booby trap and cause the car to explode). When Toadie arrives to look at the tanks, both the doors are now closed.
Continuity mistake: Throughout the whole film, Max's interceptor has windshield wipers attached sometimes, and sometimes it doesn't. Probably because they were using more than one interceptor for the movie.
Visible crew/equipment: In the final truck chase scene, Wez shoots Warrior Woman with a quad-barrel arrow gun. In the shot where the arrows impact on her, a guide wire for one of the arrows (red-tailed one) is visible.
Continuity mistake: The one shot that shows Max's car approaching and colliding with the rear of the landau coupe in the opening chase scene is reversed. The car has one door mirror on the driver's side (right) but here we see the mirror on the left, as is the car's driver. The blower's belt is on the right side when it should be on the left. (00:05:30)
Revealing mistake: After Max gets the rig inside the refinery compound, Pappagallo drives off Humungus' horde with a flamethrower. The moment he stops firing, one of the goons hits him in the leg with a crossbow bolt. The moment the bolt impacts, a guide wire can be seen. (00:52:20)
Answer: Maybe the Judeo-Christian bible "The meek shall inherit the earth" (Matt 5:5). Not much of a stretch that someone in that environment would change meek to vermin.
Nikki