Roy's first blow with the baseball ball to Chuck is to his buttocks or lower body, yet there is blood spray on the nearby car.
It is unexplained how, while one of the women is captive, the duct tape becomes lowered from covering her mouth.
When Grone shoots Chuck through the back of the head at close range in the desert, there is no exit wound of the bullet, nor any blood splatter.
When Grone asks the prostitute to undress, she says "Sure", and he steps into a closet to retrieve an article of his mother's clothing for her to wear. When he returns, she is fully clothed.
The liquid Patti drinks from the dog/cat water bowl is yellow, yet she seems oblivious to it.