Other mistake: When Johnny is complaining about Tom Wheeler while the guys are preparing lunch, Squad 51 is dispatched to a structure fire so Roy and Johnny head out of the kitchen, but Marco turns the stove flame off and the rest of the guys in the engine company leave the kitchen as well, even though they were not dispatched.
Other mistake: After Johnny gets off the phone with Tom Wheeler, and starts complaining about him while the guys are preparing lunch, there are two milk containers on the table which have orange tape covering the brand names.
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 ★