Visible crew/equipment: When the school buses depart from the school for Yosemite you can see the reflection of the crew's various tents and facilities in the buses side windows as they drive past the camera. (00:42:43)
Visible crew/equipment: After discovering John and Charlie in town Laurie drives them back to the school. The front gates are closed so Laurie honks her horn for the security guard's attention. John then get's out the car and as he does so you can see some equipment reflected in his car door just off-screen. There's some kind of large blue object and orange traffic cones definitely visible. None of it is there in wide shots. (00:33:46)
Visible crew/equipment: The first time we are introduced to Charlie and Sarah they are discussing the trip to Yosemite with John. As they walk through the school courtyard pay attention to the glass windows behind them (right side of the screen) and you can see a reflection of the camera and crew following in front of them. (00:17:59)
Chosen answer: There is no answer to that. Its simply bad work by the writers. They never tried to explain that. You could perhaps assume shock had prevented the paramedic from immediately taking the mask off. Unlikely though,.