Act II opens with Gussie's big, brash version of "Good Thing Going" from "Musical Husbands." Cleverly, it starts with her coming down the stairs from Frank's bedroom ) and the lyrics to the verse suggest she's talking about Frank) before it turns into the spashy number, which is very well performed. This was how it was done at the Huntington a few years back
But yes, there have been a few different versions of that number - Encores used a longer ending, for instance, instead of the crossfade after "it's not that nothing went wrong" as it is in the score. I seem to think that they went by the score version in Boston, but I could be misremembering.
