Revealing mistake: Torrance Beck and his men load Rockford on the car to dispose of him. They get ambushed, with 2 cars suddenly turning 90° blocking the road. Unexpected? Perhaps, but look at the asphalt; apparently it's a regular thing in that part of the road. There are already skidmarks reproducing the exact same movement. (00:33:30)
Revealing mistake: Rockford is at the public phone with his client; during the scene, the same extras (guy with grey jacket and pink shirt, a nun and others) keep walking keep and forth in the lobby all the time. (00:02:30)