Visible crew/equipment: When Roy has trouble sleeping in the middle of the night, he gets up, and when he goes to the bathroom sink, there is a fully dressed crew member whose reflection is visible in the mirror, as he moves around and looks through the door window towards the actor. Then 51's tones drop, and in the next shot we see that all the other guys of Station 51 have been lying in their beds, before getting up and putting on their turnouts.
Visible crew/equipment: When Johnny is kneeling beside the injured guy in the bull corral, the bulging outline of the mic transmitter is visible on the back of Johnny's shirt.
Visible crew/equipment: When the guys are trying to lift the engine that fell on the mechanic, the outlines of the lavalier mic transmitters and wires are visible on the backs of Captain Stanley, Roy, and Johnny.
Visible crew/equipment: During the structure fire, after Roy finds the boy and his dog under the bed, when Roy heads down the stairs and then rushes back up, as he gets to the top of the stairs when the camera pans to the left we can see the barndoor set lighting, at the top left side of the screen.
Visible crew/equipment: After Roy gets chewed out by Dr. Sunderlin, when he and Johnny get back to the station, the spotlight on the passenger side is shiny and reflective, and set lights are reflected in it, then when the dispatcher drops tones for the next run, the spotlight has been sprayed with a dulling spray.
Visible crew/equipment: While en route to the mechanic whose engine fell on him, Mike is driving Engine 51, and seated backwards in the jumpseat behind Mike is Marco, who's wearing a helmet and his turnout, but in the shot from the POV behind Mike, we see the reflection in the rear-view mirror of the grey haired crew member, who is seated facing forward behind Mike.
Visible crew/equipment: After the guys get back to the station following the structure fire, when Roy and John discuss Roy's decision about possibly going to 98's, the lighting equipment is reflected in the driver's side spotlight.
Visible crew/equipment: After the structure fire, when Engine 51 and Squad 51 back up into the apparatus bay, the top of the set at the rear bay door can be seen.
Visible crew/equipment: When Squad 51 is dispatched to an 'unknown type rescue', after stopping at the side of the road to talk to the two guys, when the squad follows the motorbike, the corner of the crew's reflector screen becomes visible as the squad pulls onto the road and drives off.
Visible crew/equipment: After rescuing the man from under the engine, when Roy and Johnny load him into the ambulance, the reflections of the array set lighting are visible on the ambulance windows, as Johnny and Roy close the back doors.
Visible crew/equipment: When Roy and John are at the bull corral, trying to rescue the guy who's been gored, in the closeups of the bull we can see metal piping at the top, right corner of the screen, as the camera moves.
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 ★