When Morgan is attempting to join the police chase as Reid gives directions, he drives past the same pink building at least three times, suggesting that the creators simply reused the same clip repeatedly.
The unsub shoots out the driver's side window on his first victim's car, then when the car flips, the window is intact again.
When Norman Hill is sawing the barrel off the shotgun, the sound is that of sawing wood, not metal.
When the Unsub's first victim's Mercedes crashes, there is no one inside the car.
In the vehicle chase towards the end of the episode, Norman's car appears to have CA exempt license plates, only on state owned vehicles. It is implied that the vehicle owned by Norman isn't a state or work owned vehicle but his own personal one, he wouldn't have exempt plates.
The unsub is described at one point as being of "average build." Mitch Pileggi is 6'1" and an amateur body-builder. In real life, he's quite large; you can get a sense of this when Shemar Moore grabs him near the end of the episode: Pileggi is larger than Moore, whose "beefy" physicality is regularly commented on.