Continuity mistake: When 14k is killed by the Dreadnought, there is one shot of the tank barrel on the Dreadnought pointing straight and then lowering to face 14k's car. There is a shot then from the side of the Dreadnought speeding along with 14k's car on the trap, and the tank barrel is back facing straight ahead. The camera then cuts to a shot from in 14k's car and the barrel is now pointing down at 14k's car again. There is no time for the barrel to move that fast.
Revealing mistake: During the first stage and just before his death, Grims' tyres get blown out, causing him to barrel roll down the track before getting bombed from behind by 14k. The car then lands upside down after hitting a sign. When it lands, you can see at least two tyres, both intact without any signs of puncture or even damage.
Continuity mistake: In the opening sequence, the dodge ram gets wrecked by the tombstone and has what looks like 2 working RPGs on the roof remaining. When he lines up the shot coming up to the finish line, there is a view of the roof showing a fully working rack of RPGs and no damage to the car.