Other mistake: After getting the hermit out of the cave, Roy asks Marco to take the EKG leads "over there", but then hands them to Chet (played by Tim Donnelly) saying "here Tim", and the subtitles read that Roy says "Chet."
Other mistake: During the fire at Hammond Chemical, when Engine 7 rolls up and lays duals, we can see the vinyl material adhered to the top of the cab covering the engine company's real number.
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 ★