Like most people posting here, the light effects caught my eye right away. I'm pretty sure the dancers we controlling their lights manually with the small belt mounted control panel mentioned earlier. I think I enjoyed Fergie's look best, but maybe that wasn't so much to do with the effects.
You'd be surprised how many non-lighting enthusiasts noticed the technical snafu's. My wife and daughter both pointed out issues I didn't see right away.
The audio engineer for that half-time show should be hanging his head in shame. Not sure what he was listening to in the truck, but that was one of the worst mixes ever. They would have been better served playing a track back and lip syncing (like they've done in previous years). To their defense, though, they literally have minutes to roll on and assemble the stage, gear, and people. I know it's designed to go together quickly and they do run throughs a head of time, but if something doesn't come together at show time there's no room for debugging.
Ah well, it's fun to be a Monday morning quarterback (pun intended).
-Mike
