As a devoted childhood fan of the movie, I was surprised that they changed SO much of the plot from the movie, but I also understood they needed to give the Lydia character more to do.
That said, the show was fun and goofy and had lots to look at lol. I feel like they won't be able to fully replicate much of the cool stuff on tour, like falling through the stage floor, etc.
The audience definitely ruined it for me though. Very obnoxious people all around me.