Bobby Van was a terrific dancer. He and Gallagher were sensational. The show was fun and breezy, with great choreography and production values (sets and costumes).
Ruby's tapping was the icing on the cake. Patsy Kelly (played the maid I think) had a lot of funny bits and lines. It was a huge hit - deservedly so.
And, of course, the show has a crowd-pleasing score.