While the story line requires that they attempt to seduce each other's girlfriends, neither went far in exploiting the laugh potential in those misadventures. James Grainger as Don Alfonso was frankly dull. As for laughs, most of them went to the stage crew responsible for rotating the sets and stitching the drops together as the scenes changed. Someone connected with the production probably knows why some of those changes were made with the curtain open while others were hidden from view. For what it's worth, the audience seemed to take more pleasure from watching the crew.
Some people are determined to get the laughs they've paid for.