Visible crew/equipment: When Station 51 arrive at the movie studio, after the car's explosion Captain Stanley tells dispatch to respond another engine, mobile aid unit, and another ambulance. In the next shot from the interior of Engine 51, the cameraman and camera are visible in the passenger side mirror.
Continuity mistake: While Roy and Johnny are studying, after hearing Roy's positive horoscope Johnny tells Chet his birthday is August 28th. However, in the pilot episode "The Wedsworth-Townsend Act," Dixie has a get-together as a combination celebration of John's birthday and gathering of the supporters of the paramedic program. At the party Dixie offers the hors d'oeuvres to Johnny saying, "You first, it's your birthday," as he takes a mouthful of food. During that week we see people wearing coats, and the many deciduous trees (not the evergreens and palms) in LA County have already lost their leaves, which means it's certainly not summertime, August 28th.
Visible crew/equipment: When Station 51 is being dispatched to 'auto accident with injuries' there's a closeup of Sam Lanier, the dispatcher, and in the next overhead shot of the apparatus bay, we can see the reflection/shadow of equipment moving on Engine 51's windshield, at the bottom left corner.
Continuity mistake: When Roy and John are helping Jeanine get her head unstuck from the table, Jeanine's braid is very loose and coming apart, but when her head is free and she jumps into her mother's arms, Jeanine's braid is braided properly.
Continuity mistake: After Dixie has the talk with Molly about using 51 as a crutch, it cuts to the shots at the movie studio with stunt drivers being chased, and the passenger who has his head out the car window is bareheaded, but in the closeup he's suddenly wearing a knit cap on his head.
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 ★