It's superimposed. It appears on the big pyramid during the WC rounds. Hope that clears the confusion.
I'm guessing that you're trying to say that there isn't a physical clock readout in the wall, but that it appears on the wall above the top category box during the bonus round?
If memory serves, the blue area of the wall where the category boxes are is all video, so it would be a fairly simple task to add a video clock in the video feed.
It was actually with Peri Gilpin and Ice-T.
I would presume that if this episode never airs then the contestants don't get the prize money they won on the show? That'd be a major bummer for them.
Unrelated, I'm really surprised and disappointed to not see Rosie O'Donnell on the returning guest list. I know folks have varied opinions about her, but I thought she was an excellent, competitive game player -- something that makes for good TV.