regarding the grubbs, I might be wrong cause it was a while ago, but I think too when the show moved from the new amsterdam, they got rid of the grups that popped out of boxes and replaced them with the ones that I believe all the productions use, where they glide in on a track and have moving elements and are being a tuft of 'grass' rather than coming out of a box/
http://www.flickr.com/photos/27199361@N08/ Phantom at the Royal Empire Theatre