After Marcus's head is crushed by the truck, Nina and Liz find him and his head is obviously missing. When we see him in the hopper in the rear of the truck (recognizable by his snakeskin boots) his head is intact and attached.
When Liz is drinking liquid from the rusted can, it runs down her face; in the next shot, her face is clean and dry.
When Nina is turning the truck around by herself, we see the truck's tachometer. The tachometer is reading zero RPM, which means the truck's engine is off and cannot be moving.
The last post-coital shot of Craig is flipped, making his tattoos appear to be on the wrong arm and the wrong side of his chest.
When Marcus is running from the man with the gun, he hides beneath a broken down bridge or pier. Right before he goes under a man is visible in the top right corner of the screen.
During the initial meeting with the road train, there's a vehicle seen at least twice in the reflection of the front bumper of it.