Visible crew/equipment: When Johnny walks out of the ER, and finds out from Sally that Roy's been spreading advanced publicity about Johnny's 'modeling career', and then when Dr. Knott joins them, the outline of the mic transmitter is visible on the back of Roy's shirt.
Visible crew/equipment: While en route to the boy who fell in the hole, 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: When Squad 51 responds to 'man injured', when they arrive at the house, Johnny asks Roy if there's a dog on the roof, and it cuts to a shot of Sheba, the dog, just as she glances toward the tree, and behind the tree we can see the moving legs of a crew member, likely Sheba's trainer.
Revealing mistake: When Johnny and Roy are in the storm drain searching for the two missing boys, all the walls have very distinctive water stains and markings, and the same walls and drains keep repeating, no matter the distance they have walked.
Continuity mistake: When the tones drop for the structure fire at the hotel, the dispatched companies are: Engine 4, Engine 51, Engine 37, Engine 105, Truck 8, and Battalion 14. However, at the fire we see Engine 16, Engine 27, Engine 10, Truck 98, and Battalion 14 instructs Engine 23 and Engine 19 over the HT.
Continuity mistake: When Roy and John are with Boat 110, after the Harbor Patrol cancels their incident response, we hear that Engine 110 and Engine 58 are dispatched to 'aircraft down' and Boat 110 heads there as well, but when Boat 110 reaches the shore, we see an engine and a squad behind the airplane, just before more of 110's guys appear.
Continuity mistake: After Johnny and Roy rappel down into the canyon to rescue the unconscious hiker, when Johnny reaches the hiker, suddenly there's a grey 12" reflective strip attached to the back of his life belt, where there was none before. Then it vanishes when he gets the stokes basket, but it reappears when they attach the stokes to Truck 43's snorkel.
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.
Visible crew/equipment: When Squad 110 pulls up to Chopper 14, the reflection of the reflector screen is visible on the squad's surface, and when all the guys climb into the chopper, the reflector screen's reflection is visible again.
Continuity mistake: Before 51's guys rescue the burglar trapped in the air conditioning duct, Vince's helmet has a highly polished and reflective surface, but when Vince reads the Miranda rights he's wearing a different helmet, it now has a matte surface.
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: 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.
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 ★