After Louis and Charlie manage to take control of the situation with Smith's men, Charlie takes one of the men's shotguns. He cocks the gun twice, without firing it. The first time is when he first finds the gun, and the second is when Smith is trying to discourage him to not shoot him.
When Charlie jumps into the lake with Jessie, he is wearing solid navy blue boxer shorts. Later when Charlie tells Louis to get his scissors out of his pocket, Louis lifts up his shirt and grabs the scissors and reveals that his boxer shorts have changed to green with a design, even though they are traveling with no additional clothes.
When Charlie is about to jump into the water fall pool with Jessie he is still wearing the "body paint" they used to disguise their scent from Kangaroo Jack. Before he jumps in, his paint disappears and reappears with each shot. He finally jumps in and without scrubbing at all, and comes out spotless and free of body paint.
After Charlie and Louis hit the kangaroo and get out of the car, the Pepsi can in the back of the truck changes position. It starts on the left beside the bag and ends up on the right side beside the cooler.
Just before Charlie and Louis hit Kangaroo Jack the jeep's shadow shows that the sun is low in the sky on the left. After they hit the kangaroo, the sun is on the right. Just after the Kangaroo wakes up and jumps off the jeep, the sun is back on the left again.
When chasing the kangaroo in their rental 4WD, an aerial shot shows it to be longer wheelbase with a spare wheel on the bonnet and a khaki colour. When it cuts back to a land based shot the car is dark blue, shorter and no spare wheel.
When confronted by dingos, the shadows of Charlie and Louis are to the right in the ground level shot, yet the immediately following aerial shot shows the shadows pointing in the exactly opposite direction.
When receiving their instructions while still in America, Charlie and Louis are told to drive north from Sydney to Coober Pedy to deliver the package to Mr Smith. Coober Pedy is in fact west of Sydney.
The propeller was clearly still spinning when the aircraft crash-landed with no undercarriage causing it to touch the ground before the rest of the aircraft. Consequently, its blades should either have been smashed off if it were wood or bent back to point at the tail if they were made of metal. Instead, they are shown virtually untouched as it lies in the desert.
If the American gangsters are looking for the two missing couriers in the middle of the desert, why would they throw the pilot out of their car when they realise that they had been his passengers and he might, therefore, have a good idea of where to find them?
According to the plot, all the characters callously leave the pilot and the aboriginal drier to die in the blazing desert. The pilot has already complaining how he had been left to die in the desert when Frankie picks him up and, shortly after, he and the driver are both thrown back out with no further mention in the script.
When they are walking across the desert after the air crash, their shadows are precisely to their left. Since Australia is in the Southern Hemisphere, this means that they must be walking generally west, yet, in the previous scene, they have only just asked for directions on how to walk east.
If the pilot, shot with a tranquilizer dart, is unable to hold the joystick before the crash and has lost all bodily motor skills, how is he able to raise his right hand, let alone speak, immediately after the crash?
When Charlie and Louis leave the crash site, their shadows are to their exact left, but when confronted by dingos, the ground level shot shows their shadows to be to their precise right, indicating that they are walking back the way they just came.
The goof items below may give away important plot points.
When Mr Jimmy arrives in the helicopter he shouts "Australian Police". Each state has its own separate police force, "Northern Territory Police", and there is also the "Federal Police", not known as "Australian Police".