Possible Clues:

• "Field of Dreams" field?
• The field of film
• Spooky group keeping people up in House of Usher?
• Regularly action team attached to a leisure venue
• CIA men disturbed in picture-house
• The movies, as an art
• Movie setting?
• The pictures of medicine man removing denim
• Big-screen agents retaining troops seen in retreat
• Screen employees coming back into agency