Mel Gibson only has sixteen lines of dialogue in the entire film, and two of them are "I only came for the gasoline." Mel Gibson went into a filling station (aka "gas station") in Agoura Hills, California in March of 2024, ironically, to buy a gasoline container. Mike Johansen was working there and while Mel was going to get it, Mike casually quoted, "I only came for the gasoline". Mel didn't get the joke right away but eventually did and remarked, "oh, so THAT'S what you meant". Mike appeared with Vernon Wells(Wez) in another film.
The dog used in the film, named simply "Dog", was obtained from a local dog pound and trained to perform in the film. Because the sound of the engines upset him (and in one incident, caused him to relieve himself in the car), he was fitted with special earplugs. After filming was complete, he was adopted by one of the camera operators.
One of the spectacular stunts in the film, in which one of the motorcycle-riding raiders hits a car, flies off the bike, smashes his legs against the car, and cartwheels through the air towards the camera, was actually a genuine and nearly fatal accident. The stuntman was supposed to just fly over the car without hitting it. He survived, but his leg was broken badly. The moment looked so dramatic that it was kept in the film.
Humungus was originally supposed to be Max's partner Jim Goose. The production decided against this, but left a few hints, such as horrible burns behind Humungus' goalie mask, his raiders' use of police vehicles, and his own use of a similar weapon to the MFP's standard sidearm.
According to cinematographer Dean Semler, the camera rig used to get medium close-ups of Max driving required him and an assistant cameraman to stand on a small platform mounted to the driver's side of the car. They found out during one sequence that they miscalculated the lift, because whenever they went up or down a hill, the platform would actually scrape the ground, sending out a shower of sparks. (Initially alarming all involved, they just shrugged and kept shooting without cutting.)