Did you notice when the President made it to the reviewing stand that the two SS agents sitting behind him were having a whisper session. I had a picture of it, but had to delete them all because our hosting site was full.
I wondered what they were saying.
If I had to guess, I'd say #2 was informing the lead agent of the detail's status since GWB and his family were back inside the protective bubble at the WH. There would have been a shift change around that time, since the agents on the inaugural detail were up very early, and because they probably no longer needed the massive number of on-duty personnel.