In Season One, Episode 9 "Father Knows Best" Sergeant James Doakes & Angel Batista Are Driving Along In the car when Doakes notices a man walking along a bridge and he yells to Angel to turn around and then jumps out of the car and chases him under the bridge where there are 2 shots. When angel arrives after parking the car he sees the man laying dead under the bridge by the water, If you look at the cement bridge ledge at "5:41" you can see spray paint writing and there is no blood splatter at all, then when the police show up to secure the scene you see dexter on a ladder at "6:09" examining a huge blood splatter pattern on the bridge ledge which was not there a few seconds ago. This was a mistake that should have been caught.