Visible crew/equipment: As Sam and Rhonda have Fiona's car confiscated, when Fiona runs out shouting, "I can pay for those parking tickets!" the crew's black mat is laid out on the walkway, but in the overhead shot when she tries to run away that mat is gone. (Visible on fullscreen DVD.) (01:28:10)
Visible crew/equipment: At the pool, when Sam brings the salmon plate to Fiona, just as she rushes down the stairs, the shadow of the boom mic and pole is seen moving from right to left, along the grass. (00:06:40)
Visible crew/equipment: When David and Ryan force Austin to sit on the bench and meet the bachelorettes (with 'Dating Game' music playing), the white actor's mark is visible on the ground before Austin covers it with his foot. Also, when David introduces bachelorette 1, then bachelorette 3 and after Mrs. Wells says hi to Ryan, the green actor's T-mark is visible at David's feet. (Visible on fullscreen DVD.) (00:57:20)
Visible crew/equipment: When Austin is putting up the Cinderella fliers at school, in the first shot as he, David and Ryan walk forward, the blue actor's mark is visible on the floor behind Ryan, where he and David were just standing. (Visible on fullscreen DVD.) (00:52:50)
Visible crew/equipment: During the football game, in his close-up when Austin shouts before the hike, "Down, set 28 guarding..." the large white reflector screen is reflected on his helmet. (01:24:00)
Visible crew/equipment: When Rhonda's in the kitchen with Bobby, and she tells him that it's enough with all the salmon dishes, as the camera zooms in we can see the crew member (wearing a pouch at his hip) with his arm up, at the left of the screen, as he's presumably holding up the boom pole and mic.
Visible crew/equipment: As Austin is putting up the Cinderella fliers at school, David tells Austin that he listens to him but promptly gets distracted by a girl. At the start of the next shot, as the girl walks forward the red actor's mark is visible on the floor behind her, where she was standing until she got her cue. (Visible on fullscreen DVD.) (00:53:10)
Visible crew/equipment: When Austin is putting up the Cinderella fliers at school, just as he tells David and Ryan, "The phone's locked. I keep getting messages like...," the red actor's mark is visible on the floor behind Austin and the white actor's T-mark is visible on the floor behind Ryan. (Visible on fullscreen DVD.) (00:53:20)
Visible crew/equipment: At the start of the first scene in the diner, just as we hear Sam begin to say, "At Hal's, everyone felt like family," the actor's green T-mark is visible on the floor, where Eleanor was just standing. (Visible on fullscreen DVD.) (00:01:45)
Visible crew/equipment: While Sam tries to beat Fiona back to the diner, Fiona and her girls walk into the diner, and when Fiona walks behind the counter, the actor's white T-mark is visible on the floor under the counter, in front of Eleanor's skates.
Visible crew/equipment: When Sam is giving Carter a lift to school, after Carter closes the passenger door, just as the camera moves in closer the reflections of moving equipment (likely the boom) and a crew member are visible in the vent window. (00:11:05)
Visible crew/equipment: In the last scene, when Sam and Austin are at the San Fernando Valley overlook, at the start of the close-up of the Princeton decal on Sam's restored Mustang, the reflections of two crewmembers are visible on the car's surface above the decal. One on the left wearing a white shirt (with arms crossed) and one on the right that joins the one on the left. (01:30:25)
Visible crew/equipment: Just before Sam and Carter show up at the pool for Carter's Zorro reveal, when Shelby, Caitlin and Madison are walking towards the camera as Caitlin says, "He was so mysterious, but really obvious...," the shadow of the crew's equipment moves forward with the trio, on the ground behind Caitlin. (Visible on fullscreen DVD.) (00:55:00)
Visible crew/equipment: In the diner's parking lot after the dance, when Carter slams the Mercedes into the sign pole, in the close-up of the car's front end the reflection of a crewmember is visible on the chrome grille. (00:51:25)
Visible crew/equipment: The camera and a crew member can be seen in Gabriela's car when she is practicing her "speech" at the gas station.
Answer: Yes, this happens in most schools. The reason is that students are more likely to pay attention to announcements that are not made by a boring school employee. In many American schools, we have a phenomenon known as "home room". This is a short period usually first thing in the morning that is non-instructional when announcements are made, forms are filled out, and administrivial functions that don't have anything to do with any one class. At schools that don't have this, they have a thing called "study hall" or "independent study" which is a period where you sit in a classroom and work on your assignments, special functions for the school admin. like you are talking about are frequently done at these periods by students who are "working in the office" rather than studying. Then, there are schools that actually have classes in journalism, broadcasting, etc. where this activity would be part of the schoolwork.
Myridon