Travis breaks into Carlton by throwing a rock through the window very close to the doors, and easily noticeable to the crowd outside. Yet later, the parents are discussing how to get into the building because the kids locked the doors.
When Daphne walks up to Noah and tells him her hearing aid battery died his locker is open. When he hands her new ones it is closed. He is in frame the entire time he is not seen closing it.
The pin in the map representing the "Occupy Carleton" supporters in Miami is placed in Florida far from Miami.
The Gallaudet uprising is not a very valid model for the Carleton students, because when the Gallaudet students occupied a building to protest the hearing president, they hindered operation of the school. Carleton is about to close anyway, and holding a building there would not be leverage in a fight with a school board that meets elsewhere.
There is no indication that the students have done anything to bar the doors of their occupied building from simply being unlocked by the security guard's keys.