I saw it a bunch throughout its NYTW run, and really love the album. It sounds much more like an 80s album mix than a musical theatre recording, but I think that's a fair choice.
Here's what I'm noticing missing from the album -
> The two small "Rio Grande" covers from Act 1
> Zara's "Riddle of the Model/Rio Grande" reprise/song from Act 2, that precedes "Dream For You"
> Zara used to sing the second half of "To Find You", but on the album Brenneck sings the whole song
> The Lawlor parents singing a bit of "To Find You" at the very opening of Act 2
> "Faith of Our Fathers" was sung over/during "Dream For You" in the show, with the Mom as lead backup harmonies.
> "Just Can't Get Enough" is played as the instruments are tuning (for a joke), but on the album it's polished all the way through.
Happy to answer any other questions, but those are off the top of my head.