In my first draft I didn't 'introduce' CJ until the end of Pilot.... which ended up making Clark look kinda crazy... but adding him earlier... having him show up at the ball just kinda happened... and the imagery of him trying to drag Clark back to earth was just too tempting...
As for Lois' entrance *shrug* some people did miss it, some didn't...
As for the dance... there's more there that will be revealed later
