Transition - S4-E15
Visible crew/equipment: At the amusement park, when Johnny, Roy, and Gil climb up to the ride that is stuck, the outlines of the mic transmitters and wires are visible on the backs of Johnny's and Gil's shirts during the rescue.
Transition - S4-E15
Visible crew/equipment: When Roy and Johnny find the two puncture marks, from the snakebite, on the unconscious man's leg, the outlines of the lav mic transmitter and wire are visible on the back, left side of Johnny's shirt. It's also visible on the back of Roy's shirt after he is hit with the cobra venom, and on the back of Gil's shirt when he brings in the defibrillator.
Transition - S4-E15
Visible crew/equipment: After Johnny and Roy arrive at the amusement park where the boy was injured on the go-kart, when the guy who runs the go-kart track walks over to Roy and Johnny, the outline of the mic transmitter is visible on the back of his shirt, and moments later it's also visible on the left side of Johnny's shirt. Also, when the guys scare the second boy with the huge needle, as he runs away the outline of the mic transmitter is visible on the back of the boy's vest.
Dinner Date - S2-E10
Visible crew/equipment: When Johnny and Roy help the woman lift her daughter out of the car, and place her on the gurney at Rampart, the outlines of the mic transmitter and wire are visible on the back of Johnny's shirt.
Dinner Date - S2-E10
Visible crew/equipment: After Tommy rides home on his bike, Janet has the seizure, and when Roy and Johnny rush over to her the outlines of the mic transmitters are visible on the backs of both of their shirts, as well as the officer's shirt.
Visible crew/equipment: When Ed tackles with the possible OD at the car wash, the bulging outline of the mic transmitter is visible on the right side of Ed's shirt, above the belt. Then, when the man passes out, the outlines are visible on the sides of Roy's, Johnny's, and Ed's shirts. The mic transmitter's outline is also visible at the back of the deputy's shirt, when he hands Johnny the ID he found in the man's wallet.
Visible crew/equipment: When Roy, Johnny, and the trainee are with the injured man near the lighthouse, the outlines of the mic transmitters and wires are visible on the back, right sides of both Roy's and Johnny's shirts. It is also visible on the back of the trainee's shirt when they place the man in the Stokes.
Visible crew/equipment: At the morning lineup, when Captain Stanley walks out of his office the actor's small, black tape mark is visible on the floor where he stands.
Visible crew/equipment: After Johnny and the trainee run off to catch the purse snatchers, when Roy tells the officer which way they went, the outline of the mic transmitter is visible on the back of Roy's shirt.
Visible crew/equipment: When Roy and Johnny are with the nun, and Chet is helping with the kids on the school bus, the bulging outlines of the mic transmitters and wires are visible on the backs of all their shirts.
Visible crew/equipment: When the burned man is wheeled down the hall in Rampart shouting, "I'll sue you too," the actor's black tape mark is visible on the floor between Brackett and Johnny, just before Early steps on his mark. Additionally, another tape mark was visible a moment earlier, where Early stood before walking over to Johnny and Brackett.
Peace Pipe - S2-E5
Visible crew/equipment: When Roy and Johnny are with the boy whose finger is stuck in the gumball machine, the outlines of the lavalier mic transmitters are visible on the backs of Johnny's and Roy's shirts.
Visible crew/equipment: When all the guys are on the roof trying to rescue the unconscious man on the scaffold, the outlines of the lav mic transmitters are visible on the backs of Johnny's and Captain Stanley's shirts, as well as the back of the other scaffold worker's shirt.
Visible crew/equipment: When Johnny and Roy are trying to get the boy with Meniere's Syndrome out of the treehouse, the bulging outlines of the mic transmitters are visible on the backs of Deputy Pauling's, Roy's, and Johnny's shirts.
Visible crew/equipment: When Station 51 is dispatched to the movie studio, during the rescue of the injured stunt guys, the bulging outlines of the mic transmitters and wires are visible on either the backs or sides of Chet's, Roy's, and Johnny's shirts.
Visible crew/equipment: When the deputy arrives at the scene of the overturned tractor, the reflection of set equipment is visible at the hood of his vehicle, over the tire.
Visible crew/equipment: When Roy and Johnny are treating the man under the tractor, and subsequently Dr. Knott, the outlines of the mic transmitter and wire are visible on the back of Johnny's shirt.
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.
Visible crew/equipment: When the guys are rescuing the little boy from the hole in the ground, the outlines of the mic transmitters are visible on the backs of Johnny's and Roy's shirts.
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 ★