During the phone call between Kathrine and Professor, we can see the roof of laboratory. It is made of ordinary aluminium or plastic blocks, like roofs in offices. This kind of roof can transport air. Persons behind glass are doing something with danger microbes and they are in protective suits. Professor and his assistants, before glass, don't wear that suit, but the holes in roof can transfer microbes to their part of the laboratory. See more...
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Continuity: In the final scene in which a man is shot in the airport (part of this scene actually recurs throughout the movie), the psychiatrist woman leans over him to hold him as he dies. From one angle, he reaches up to her face and his hand is clean. In the next angle, his hand is covered in blood as he touches her face.