Audio problem: When Truck 85 raises the aerial ladder so Roy can get to the boy on the ledge, the aerial apparatus operator tells Roy, "DeSoto, up the ladder," and we hear Roy respond, "Okay, Cap." There are two problems here: first, Roy's mouth movements are not in sync with what we hear, and second, Roy is not responding to 85's captain, he's responding to the aerial apparatus operator. The captain is standing on the ground behind Truck 85.
Audio problem: After Johnny successfully unlocks the car with the toddler inside, when he and Roy hold him the audio we hear is of the toddler crying, even though in some shots it's obvious that he's not really crying. Additionally, when the toddler was still locked in the car wrapped in a blanket, in the closeup his hair (actually a doll's hair) is much thicker and longer than it is when they get him out.
Smoke Eater - S4-E16
Audio problem: While Roy and John are with the asthmatic boy, Roy's on the Biophone with Rampart, and we hear Early say, "Administer 0.3 milligrams epinephrin IM," but his mouth is not in sync with the last part, and it looks like he actually said, "Epinephrin IV."
Answer: I was rewatching a few first season episodes of Charlie's Angels (1976), and in S1xE6 "The Killing Kind," I recognized the same actor. So, to finally fully answer your question, the two baseball players in School Days are played by Rod Perry and Sean Fallon Walsh.
Super Grover ★