Wait a moment. There's at least EIGHT people who appear twice in that photo, and it's not a simple stitch together either. Check it out. Definitely the "live studio audience" isn't all that it's made out to be.
Pretty sure it is just a simple stitch together. The photos were taken not only from multiple angles but multiple locations as well (the opening in the back on the left side of the picture is the same as the opening the second in from the left, just from a different angle).