Above and Beyond... Nearly - S5-E20
Continuity mistake: After Station 51 is dispatched to 'man stranded on a cliff', when Roy and John free climb up the cliff, they're not wearing their uniform shoes, they're wearing hiking-type shoes with ridges on the soles.
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
Continuity mistake: When Roy and Johnny arrive on scene with the injured gymnast, as they enter the building in the exterior shot it's the last door that's open, but in the next interior shot that last door is shut, and it's the second to last door that's open.
The Girl on the Balance Beam - S5-E18
Continuity mistake: When Johnny and Roy are at the movie studio, while they're dangling from their lifelines they're trying to help the actress dangling from her own lines, but when she freaks out she drops her wand (yes, a wand) in the wide shot, but next closeup she's still holding it.
Visible crew/equipment: After Station 51 is dispatched to the landslide, when Mike pulls the engine over on the side of the street, as Captain Stanley and Chet walk past the front of the engine, the cameraman's and crew member's legs are reflected on the windshield.
Propinquity - S3-E20
Continuity mistake: The cut that Roy receives over his eyebrow during the traffic accident changes characteristics, such as when he and John are at the poker game, it looks considerably better in following shots, then it looks much worse again.
Continuity mistake: When Mr. And Mrs. Merkle visit the station the first time, Mrs. Merkle's long, pointed blouse collar jumps under and over her sweater repeatedly.
Continuity mistake: When they pull Mrs. Merkle from under the wrecked car in the restaurant, the BP cuff is not visible around her right arm, but in her closeup she has the wide BP cuff around her arm with the gauge facing up, then in the wide shot once again the BP cuff is not visible.
Continuity mistake: When Marco and Chet use the jaws to lift the car off the victim, Roy begins to get her vitals, then it cuts to Captain Stanley on the Biophone saying, "Vitals second victim, pulse is 120, respiration's 30, she's pale and clammy," but it's not until quite a few shots later that Roy actually shouts those vitals to Captain Stanley.
Character mistake: At the restaurant, when Captain Stanley's on the Biophone with Rampart, Brackett asks, "Is there any evidence of external hemorrhaging on your second victim?" and then Cap responds, "We can only see superficial cuts at this time... Pupils are equal and reactive, negative on the IV at this time," as if Brackett ordered an IV, but Brackett never said anything to Squad 51 about any IV.
Continuity mistake: After Roy finds Willy, when he calls Captain Stanley to help get Willy out, Roy's on Willy's left and Captain Stanley's on his right as they rush out, but in the next shot they've switched, Captain Stanley is now on Willy's left and Roy's on his right, just before the explosion.
Continuity mistake: When Karen is assigned to ride along with Squad 51, once they leave the station, en route to the incidents there are only two people seated in the squad instead of three.
Continuity mistake: When Squad 51 is dispatched to 'man down', as the squad heads out of the apparatus bay, the engine we see parked in the bay is the old Crown from seasons 1 and 2, instead of their current Ward LaFrance.
Revealing mistake: At the house fire, after Roy and Johnny go upstairs to rescue the invalid woman, Captain Stanley and Chet head to the front door, and just before Cap kicks in the front door, we can see that the door isn't actually closed, it's just ajar.
Pressure 165 - S5-E7
Continuity mistake: At the decompression chamber on Catalina Island, after John and Roy introduce themselves to Dr. Scott, the doctor removes the stethoscope from around his neck and puts it down, but in his closeup it's still around his neck, then in the wide shot it's gone, only to return in closeup again.
Visible crew/equipment: After Brackett tells Donny's mother that her son does not have meningitis, it cuts to an exterior shot of Roy and John driving in the squad, and the moving shadow of the filming vehicle is visible on the ground, in front of the squad.
Continuity mistake: Dispatched to the structure fire are Station 51, Engine 36, Engine 116, and Truck 3. While Johnny and Roy are searching the rooms for the young girl, it cuts to a shot of guys from 9, and later there are also shots of 28's and 19's guys, even though none of their companies were called to this incident. These are shots from previous episodes including 3x7, "Promotion."
The Lighter-Than-Air Man - S5-E8
Visible crew/equipment: When the trailer that's on fire pulls up to the front of the station, the outline of the mic transmitter is visible on the back of the woman's blouse.
The Lighter-Than-Air Man - S5-E8
Continuity mistake: When Station 51 is dispatched to the truck fire, as Captain Stanley responds to the dispatcher Roy and Johnny get into the squad, but we see Marco, Mike and Chet head back to the kitchen instead of getting on the engine, then we see both the engine and squad responding to the incident.
Character mistake: When the guy who was injured in the manhole is brought to treatment 6, he's transferred onto the ER's gurney and we see Carol taking his pulse, but then she tells Early, "Pulse 120, respiration 24," even though she never checked his respiration rate.
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 ★