Sometimes, people need to be given the obvious in order to determine the obvious! I would guess that some people HAD to have realized that yours was a Charlie Chan mystery! There seemed, from one of the images, to have been a LOT of people looking at the displays, and this could explain why some may not have been able to look closely enough to get the idea that you intended.
When I first looked at your photos, I had to check twice to make sure that it was not a full-scale tableau! GREAT JOB! The details are stunning, and, it must me my imagination, but, did Mr. Chan move and change position in a couple of frames?
Again, Louise, wonderful job, and MUCH appreciated by your humble servant...