In the scene where Willie shoots Parker & is then shot & killed by Chief Gillespie, you can see Willie still breathing before & after he is checked by Detective Tibbs.
When Cheif Gillespie enters the police station and the loud music is playing look ate the floor at Lonnie and Parker's feet the forgot to remove the marking tape on the floor (Where you are suspossed to stand for your shot)
When Willie Baylor opens the door and surprises Bobby and Nicole, there is the sound of him cocking a pump shotgun. However, Baylor is carrying a double-barrel shotgun, not a pump.