A lot of it was simply how they acted whenever the Hat was shown. For example, they were showing the slides and something like this happened...
"This was actually an idea that we had from... blah blah blah. Details. Details. Details."
*Next slide*
"Ah yes, this is the concept art for.... blah blah blah. Detail. Details. Details."
*Next slide, repeat all of the above.*
**THEN, slide of the Hat come on the screen.**
"Next."
Apparently they were talking about all the neat concept art, but when the slide came on the Imagineers laughed and quickly moved to the next slide. Also, when showing the original look and Chinese Theatre they said it is a view they hope to see again soon.