Yes they are kids and there are mental mistakes. But what I clearly see out of Sling Blade as with almost all coaches is that they do not physically practice the mental aspects of the game. For example special teams, punt return. Let's say you tell a kid to never ever ever field a punt inside the 10, 8 or 5 yd line, whatever line you choose. You place each potential punt returner on that yard line, load the ball machines up with footballs that simulate punts and vary those punts. DO NOT TAKE ONE STEP BACKWARDS. Very simple. Just like you want to practice charging low punts even if to fair catch to save yardage. Practice never touching a kickoff that reaches the end zone if you are happy with the 25 yd. line. If not, then you better have a better kick off return idea set up. Just like having a QB on the run chasing him with 30 foot brooms and forcing him to throw the ball out of bounds to save yardage. These are all simple drills, but over a season every yard they save makes the potential for success greater.