When Shawn and Gus are hiding in the dorm room closet while the thugs search the room, the position of the closet bi-fold doors changes. When looking at the closet from the front, the bi-fold doors on the left that Shawn is hiding behind is folded over, thus leaving a big space in the middle. When looking from Shawn's point of view, the bi-fold doors are spread, closing the closet door completely.
When Shawn is talking on the police radio using the hand held microphone, he correctly depresses the push-to-talk switch to speak. Immediately thereafter, he gets a response. However, when the response comes, Shawn still has the microphone switch depressed. These are "Simplex" devices, meaning only one party can speak while the other listens, as opposed to "Duplex" (like a telephone), where both parties can speak and listen at the same time.