He came out into the audience to show everyone how to use the voting buttons:

A question to test the buttons out:

Ryan Seacrest, who shows up in video a number of times between the pre-show and show:

Names of the contestants up on the video monitor, along with light changes:

 The cameraman, who is present during the pre-show and taping:

The hosts and contestants out on the stage.   Both hosts that I saw did a wonderful job. 

The Dream Ticket, which will be awarded to the finale winner each day.   The Dream Ticket will allow the winner to bypass the audition line to try out for the show.   There are currently no Dream Tickets being handed out during soft opening.   Cast members were among the guests on stage today.