Continuity mistake: During the structure fire, after the parents realize their son ran back into the burning house to get the dog, when the father tries to go after the boy we can see the man's wearing a striped T-shirt under his robe, but when Roy rescues both the boy and the dog, the father is now wearing a white T-shirt under the robe.
Other mistake: After rescuing the boy and his dog from the structure fire, when both of 51's rigs are backing up the driveway, the office door opens and we can see through the glass door that someone is standing there, even though they're all on the rigs. Next shot, that phantom individual has vanished.
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.
Other mistake: When Station 51 is dispatched to the structure fire in the middle of the night, once they arrive at the burning house, one of the first shots shows a crowd of bystanders, many in their robes. That footage is from season 1, the pilot episode "The Wedsworth-Townsend Act", during the factory fire at the start of that episode.
Continuity mistake: At the stationhouse, when the captain draws the diagram of the plastics company set-up on blackboard, the chalk drawing differs between shots.
Continuity mistake: Dispatched to the structure fire in the middle of the night are Station 51, Engine 95, Engine 105, and Truck 107, but on scene we see Engine 800, Engine 801, and also Engine 10, which is all footage from the first season's pilot episode "The Wedsworth-Townsend Act."
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.
Revealing mistake: During the structure fire in the middle of the night, when Roy rescues the little boy and the dog from the burning house, it's too obvious they are a doll and stuffed animal.
Continuity mistake: After Johnny moves the squad forward in the apparatus bay, he heads to the kitchen to get Roy, and in the next shot there's a rolling mop bucket with two mops that suddenly appear in front of the kitchen doorway.
Continuity mistake: When the guys are in the garage with the mechanic who had an engine fall on him, when Johnny contacts Rampart, Dixie presses the fifth button on the tape recorder, to record the transmission. Once they lift the engine off the mechanic, when Johnny contacts Rampart again, Brackett presses both the third and fifth buttons to record the transmission.
Continuity mistake: During the structure fire, when Roy walks into the burning house his SCBA cylinder has a large arrow sticker on it, but when he's in the house searching for the boy it's a completely different tank with two red stickers, then when Roy goes upstairs it's back to the original tank.
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.
Continuity mistake: During the raging brush fire, the scoop stretcher is sent down the cliff to the paramedics in the canyon. Once Gage has it and then drags it towards DeSoto, the boxes and gear switch positions between shots.
Visible crew/equipment: Amid the possible threat of fire from wind shift, when Johnny and Roy rescue the unconscious hiker (John Travolta), the bulging outlines of the mic transmitters are visible on the backs of Johnny's and Roy's shirts, and also the second hiker's shirt.
Visible crew/equipment: When Johnny and Roy are trying to get the boy's head unstuck from the small window opening, the bulging outline of the lav mic transmitter is visible on the back of Johnny's shirt.
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 ★