The cups of coffee that Jonah brings into Glenn's office are empty. Not only do the actors handle them as if they have no weigh to them, but the insides of the cups can be seen and there is nothing in there.
Sandra tells Mateo that she couldn't find the reference photos for the new displays, because Amy and Garrett took them from the photo lab. The photos that they took were just the same images used for the display, but smaller, not photos of how the display should be set up. Photos like that would be useless as reference for setting up the display.