Actually, there were two moments. The first (sorry, I can’t remember the point in the speech, just the recognition that something was up) was a caribou in the headlights look that lasted about 1/20 of a second, and she caught herself on a word that was at first out of place.
The second, a little more obvious, came about halfway through, when she said a big “Well!” and then switched topics completely. I thought at the time that there was a big disconnect, but I didn’t know why.