Continuity mistake: When John first explains how to rescue the little girl in the hole, he wraps his left hand around his right wrist, but in the next shot it's his right hand that's around his left wrist.
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.
Audio problem: After Tom Wheeler and his partner Kirk show up to assist with the trapped girl, when it cuts to Roy down in the rescue shaft we see him ask Johnny, "Do you see her yet?" but we don't hear any audio, just before we hear Johnny say, "We're getting close." Additionally, earlier at the start of the little girl's rescue, when Johnny tries to loop the rope around Helena's wrist and it doesn't work, he says,"Damn it," but the subtitles read "Darn it."
Continuity mistake: While John's lying in the lateral tunnel when digging to reach Helena, his entire uniform is covered in dirt, but when John pulls her out and is with Roy in the rescue shaft, John's uniform is only a little dirty, nowhere near as filthy as it was just moments before.
Visible crew/equipment: When John and Roy are tunneling through to the little girl trapped in the hole, they're in the second larger hole that has been shored up on all sides with wood (to keep it from collapsing), but when Roy points the chrome flashlight down the lateral hole Johnny's digging in, we can see in its reflection that the fourth wall doesn't exist, where the camera and lights are located.
Revealing mistake: On scene with the little girl trapped in the hole, when they shine the flashlight down the hole in the overhead closeup, it's too obvious that it's a doll with its arm raised up, plus the fact that we see plenty of space around the doll, contradicting the plot of the little girl being wedged in a tight space.
Revealing mistake: When Johnny and Roy are on the schooner, with the unconscious man hanging upside down from the mast's rigging, as they pull the man up the safety harness around the stuntman's ankle is visible.
Visible crew/equipment: While Roy and John are on scene with the "car over cliff" Johnny heads down to the car too quickly, and when he ends up falling his mic transmitter and cable slip out from their hidden area, and become visible on the front of his shirt.
Revealing mistake: When Squad 51 is dispatched to the man who has difficulty breathing, once they arrive and it cuts to a closeup, at the top of the screen there is a small dark film square that moves towards the left corner, and then it stays there in the following shots facing Johnny, until he contacts Rampart on the Biophone.
Visible crew/equipment: When Early and Brackett try to deal with the elderly group who want to see their friend, as the group walk away toward the waiting room, two actors' T-marks are visible on the floor, one of them is at Dixie's feet, the other beside her.
Continuity mistake: When the guys are listening to the baseball game on the radio, dispatch drops tones for Engine 16 and only Squad 51, yet Chet turns the radio off, and all the engine company guys rush out of the day room then head to their rig, even though it's only Roy and John that were dispatched.
Continuity mistake: When the man who doesn't speak English is in treatment 4, there's a closeup of the Datascope 850 monitor, and then the girl points to the EKG monitoring unit behind the gurney and asks Dixie why the thing is bouncing up and down. Problem is that the Datascope 850 is used by the paramedics and it's not actually in that treatment room. The treatment room has a Zenith Travenol unit.
Continuity mistake: When Roy breaks the key in the squad's ignition, while he's holding the broken piece in the two wide shots there's something dangling from the key's hole (another key/keychain), but in the closeup it's just the broken bit in his hand.
Continuity mistake: When the man who doesn't speak English is lying in treatment 4, in Dixie's closeups she and the patient's 'friend' are standing in front of the wall with the white dispenser, but in the repeated wide shots of Early with the patient, that wall is seen behind Early and nobody is standing in front of it.
Visible crew/equipment: When Squad 51 is dispatched to the man trapped in the freezer, Johnny and Roy get into the squad, and the reflection of the large set lighting can be seen on the passenger door and vent window.
Visible crew/equipment: After Squad 51 arrives at the scene of the parachutist who's stuck in the tree, when Roy tells dispatch to have an engine respond to their incident, the reflection of array set lighting is visible on the squad's surface.
Visible crew/equipment: After the man with trichloroethylene poisoning is hosed down and loaded onto the ambulance, while Roy's on the Biophone with Rampart, John's uniform jacket is pulled open with his hands on his hips, and we can see the outline of his mic transmitter in his shirt pocket with the wires coming out of the pocket.
Continuity mistake: Responding to the elevator call, in the overhead shot Squad 51 pulls up adjacent to the street awning when Gage and DeSoto get out, but in the next ground shot the squad is 20-25 feet farther down.
Continuity mistake: When the guys are dispatched to the cardiac patient stuck in the elevator, Gage leaves the mop and bucket in the middle of the floor in the apparatus bay and rushes to the squad, but when they roll out the bay floor is clear.
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 ★