Looking forward to the future:
One thing that most people don't realize is how hard it is to make changes to a show once it's in previews. And a show like this is much harder than most. My guess is that the show, as it played last night, is between 30 and 45 minutes too long. But every time someone tries to cut the show down, the costume lady will run in and say, "No, you can't cut that song, I need that time to change Mary Jane's costume." Or, "You can't cut that scene with the 'Geek Chorus', we're hooking up the Spidermen, and we need the time". So you end up leaving a lot of material in the show, not because it's any good, but because you need that to time to cover set changes, costume changes, and the like.
NOT TO MENTION that the show, as of last night, simply falls apart at the end of act 2. There has to be a big, impressive, flying SOMETHING at the end, and although I'm sure a big ending is in the works, it still has to be rehearsed and put into the show. So rehearsal time has to be set aside for this as well.
This show will almost certainly delay opening for at least a couple of weeks, probably into February. There will be a lot of cancelled performances, to create additional rehearsal time. And the press is going to be breathing down their necks every step of the way.
And with those cancelled performances, combined with overtime, the cost of this show will continue to balloon...
Behind the fake tinsel of Broadway is real tinsel.