Thanks, kirky. I got it from the official site. I'm not familiar with this work, though this is not the first time there has been a crossword like this in which the extra letters give characters from this particular TV series.
the author of the play is the whole of the bottom line (4,9).....the play is the whole of the top line (6,7) 2nd word of the play is the 6 people that the extra letters spelled out