Revealing mistake: As Machine Gun Joe runs slowly runs over a fisherman in a small brook, he stops and "peels out" on his head. You can see a film crewman in the driver's seat doing the actual carnage.
Revealing mistake: You can see the threads moving the submarine underwater. (00:04:55)
Revealing mistake: You can see the wires on the handgun pointed at the two extraterrestrial children when the bad guys are staring in shock at the "floating gun."
Continuity mistake: As Blood tries to persuade Vic not to follow Quilla June into the Down Under, he is hopping with his broken right leg raised. In the circle he makes after Vick stops, he puts his weight on the leg for two different steps without ill effects or complaints. (00:53:55)
Continuity mistake: At the very beginning when they are all getting into the yellow Ford car an outside of car camera cut from the front of the car to the side shows the lady's arm firstly inside, then rested on the door.
Continuity mistake: Jonathan explains how to deal with a biker, demonstrating on Blue who's sat on his bike close to the rail. Yet when he's talking to the new guy (Toughie)Blues bike is in the middle of the track and when Toughie comes around the track to attack Jonathan it is back in its original position.