Visible crew/equipment: When Kumar peels out backwards at the whorehouse, you can see the tow line attached to the undercarriage go slack. It disappears when the camera angle changes. It's also a revealing mistake in that it shows how they were able to do the stunt with the actors in the car. (01:15:20)
Visible crew/equipment: When the Department of Homeland Security vehicle is pulling up outside the airplane hanger, to detain Harold & Kumar from the airplane, you can see the crew and lighting equipment reflected in the door as it opens.
Visible crew/equipment: When Kumar hops into the yellow Mustang the first time, you can see the crew and camera reflected in the door.
Answer: The Guantanamo prisoners are all perceived terrorists, presumably working in coordination. It's essential that they not communicate with each other, so as to prevent them from leaking info about U.S. security.
Charles Austin Miller
I think it's also to prevent the prisoners from planning attacks on the guards.
How would they leak information about U.S. security? Most people in the Middle East have no knowledge about U.S. security.
Because people are occasionally released, and whether terrorists or not, may have information others would find valuable - about what goes on in Guantanamo Bay, if nothing else.
Jon Sandys