Brillio wrote:
I wonder (in total speculation) if Brandon's being there at the Superbowl contributed to Kelly's unusual nervousness. I know it may not have been the only reason... but I would be crazy nervous around someone I was attracted to and who showed signs of liking back, flirting and all.

My guess would be that she didn't even talk to or notice him until after she sang the National Anthem, being all focused and such.   It sounds like she was nervous leading up to it just because people kept mentioning Christina messing up the previous year.  So I wouldn't think him being there would have mattered.   I'm betting afterwards is when they were actually able to chat more and she found out he was single.