Other mistake: When the Happy Toyz truck is first being fueled, the nozzle handle is locked into the fuel position. When you hear the click of the nozzle stopping, the handle doesn't disengage as it should. When the attendant checks it, he unlocks the handle, and doesn't squeeze it again. Even accounting for the comet's effects, the handle must be squeezed to splash fuel in the man's face.
Other mistake: In the pop machine scene, player number 7 gets hit in the head. Yet he stands there like nothing happened before he finally falls down and dies.
Other mistake: On the ball field, the one kid running away gets hit in the lower back by the soda can. Problem is the soda can looked as if it were tossed in a gentle arc rather than directly at him. Also, it barely touched him, and he took a few more steps, then grabbed the spot it hit him, then fell, rather than falling immediately.