Revealing mistake: In the fight scene between Riddick and Johns, there is a wide shot of them both fighting over Johns' shotgun. In this shot it is apparent that it is not Vin Diesel in the shot but in fact a stunt double.
Revealing mistake: Claudia Black's character "Shazza" drives the vehicle back to the ship as the eclipse starts to take place. There is a front shot of the vehicle as it is driven through the bone yard. In this shot it is obvious that it isn't Claudia Black driving the vehicle.