Visible crew/equipment: When Squad 51 is dispatched to the car on top of a roof, it cuts to John and Roy driving in the squad as John responds to dispatch, and the reflection of the filming vehicle is visible on the squad's surface.
Visible crew/equipment: When Roy and Johnny are dispatched to the plant with an 18 yr old whose arm is caught in a machine, the outlines of the mic transmitters are visible on the left side of Johnny's shirt, when he's on the Biophone, and on the left side of Roy's shirt, when he's putting the tourniquet on the 18 yr old.
Visible crew/equipment: After Dianne's OD, once she passes out and Johnny begins to work on her and inserts the esophageal airway, the bulging outlines of the mic transmitter and wire are visible on the back of Johnny's shirt.
Visible crew/equipment: When Roy and Johnny leave Rampart and are heading back in the squad, about 16:40 minutes in, as they are discussing whether Roy has told his wife about house hunting, you can see two signs on the ceiling of the squad's cab. The signs say 'Emergency Saturday 8PM Rehearsal Mark VI Prod'. Possibly they are magnetic signs for the squad doors so people don't mistake the squad for a real fire department vehicle? (00:16:20)
Visible crew/equipment: While Roy and Johnny are climbing up to rescue the boy on the bridge, there's a closeup of the boy as he breathes heavily. When this shot pans to the right we see Roy (his stunt double actually) place the rope behind his back, and a mysterious dark gloved hand quickly appears behind Roy (and it's not Johnny's hand).
Visible crew/equipment: When Gage and DeSoto are driving away from Rampart, discussing DeSoto's possible purchase of a new house, dispatch calls about a traffic accident. In this exterior closeup shot of Squad 51, the reflection of the camera's flatbed vehicle is visible on Squad 51's red surface.
Visible crew/equipment: After Roy and Johnny speak to Chet's friend the realtor, when Station 51 is being dispatched to the accident on Harbor Freeway, in the overhead shot of the apparatus bay, we can see the shadow/reflection of production equipment moving on the engine's windshield.
Visible crew/equipment: When Station 51 is dispatched to the rescue on Johnson Canyon Bridge, just as Engine 51 rolls out of the apparatus bay, the reflection of array lighting and two reflector screens are visible on the engine.
Visible crew/equipment: When Brackett's helicopter takes off the filming helicopter can be seen through the window. (00:03:45)
Visible crew/equipment: After landing at the base camp, when Brackett and the others walk away from Copter 10 we hear the comment, "The coffee's lousy but the food's great," then we get a bird's-eye view of the base camp, and can see the moving shadow of the filming helicopter at the lower right corner of the screen. (00:06:20)
Visible crew/equipment: After Engine 51 and Copter 10 are dispatched to the "traffic accident with injuries" Engine 51 is instructed to switch to frequency 3, and when Copter 10 takes off with Brackett, the moving shadow of the filming helicopter is visible near the shadow of Copter 10 chopper. (00:09:10)
Visible crew/equipment: While Brackett is on Copter 10, after the dispatcher tells the pilot that the truck driver has been heard on the CB saying that he's trapped in the cab, repeating the same location, when we see the bird's-eye view of Copter 10 flying below, the shadow of the filming helicopter is right beside the shadow of the Copter 10 chopper, at the top of the screen. (00:11:35)
Visible crew/equipment: During the fire late at night, after Johnny and Roy run to the burning house, when Captain Stanley tells Chet to get the exposure and later warns to watch for spot fires, the moving shadow of the cameraman/camera is visible on the ground, right beside Captain Stanley's shadow.
Visible crew/equipment: At the site of the vehicle accident, the outlines of the lavalier mic and cable are visible on the back of Roy's shirt, particularly when he's with Eddie as his father's being taken in Copter 10 to Rampart.
Visible crew/equipment: After Captain Stanley and Roy get the trucker out of the wrecked cab, when Stanley takes his pulse, the outlines of the lav mic transmitter and wire is visible on the back of his shirt.
The Girl on the Balance Beam - S5-E18
Visible crew/equipment: When Brackett and Morton go to the outdoor eating area to speak with Nancy's father, just as Brackett sits down and crosses his legs, the actor's T-mark is visible on the floor in front of his chair.
The Girl on the Balance Beam - S5-E18
Visible crew/equipment: When Johnny talks to Morton about the young gymnast and the responsibility of coaches and parents, the outline of the mic transmitter is visible on the left side of Johnny's shirt.
The Girl on the Balance Beam - S5-E18
Visible crew/equipment: While en route to the woman trapped on a wire, the reflection of the cameraman is visible on the windshield after Mike drives past the entrance to Commercial Studios. We see it's not Captain Stanley, but instead it's someone wearing a white shirt, holding up something (presumably the camera) with both hands.
The Girl on the Balance Beam - S5-E18
Visible crew/equipment: At the gym, when Nancy wants to prove that she's feeling fine, she tries to do a cartwheel, and the outlines of the mic transmitter and wire are visible on the back of her leotard.
The Girl on the Balance Beam - S5-E18
Visible crew/equipment: When the ambulance arrives at the scene of the drunk driver's car accident, and then when the drunk man is loaded into the ambulance, the reflection of the location set lighting is visible on the window, at the side of the ambulance.
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 ★