Mad Max (1979)

Continuity mistake: When Goose is ambushed by the bikers, one of them throws a brake drum through the windshield of his car, making Goose lose control and crash. As the car begins rolling down the hill, you can clearly see a silver-helmeted stunt driver falling across the front seat bench.

Grease Rat: Like the sign says, "speed's just a question of money. How fast you wanna go?"

Trivia: The movie had to be dubbed into American English for its US release because of its very noticeable Australian slang.

Question: Although we see that the biker gang has about 20 members when we first encounter them, why does Max only kill 7-8 bikers after his family is run down?