The smell: A combination of body odor, Red Bull, and desperation.
The sounds: The constant clickety-clickety-clack of the poker chips. It's a seriously incessant background noise. The staff announcing open chairs over the microphone. The dealers shouting, "Winner at table xyz!" The spectators talking and commenting on the games (why watch? I find it as exciting as watching paint dry. Maybe because I don't understand the games...)
The sights: Players wearing hats and/or hoods...and sunglasses indoors! Apparently famous players plastered with advertisements all over their clothing and hats. Lots of fake boobs and ankle-breaking high heels. Media all over the place (though I've never heard of the magazines/websites.) The flashes of cameras going off in my face as my client is being photographed (he was famous, or semi-famous...who knew?) Almost everyone with an MP3 player of some sort, and either earbuds or HUGE headphones.
Altogether a fascinating experience, even if I didn't make very much money. I felt like I was doing research, maybe for sociology or something! Anyway, I was told that it's always slow the first few days, and that tomorrow and Saturday will be better. I sure hope so. But I'll always be able to say that I worked at the World Series of Poker!