From a post over at The Playgoer:
What I find most surprising about all of this is that everyone praises Norbert Leo Butz for going on and presumably "saving the show" - however, the show has understudies, and the understudy was playing the part for a week before Butz came on. No one thought they should give Butz a few more days to learn the lines (and spare the audience a performance by a guy carrying a script and calling for lines) while the understudy, who knew the lines just fine, played the part? Of course not. That wouldn't garner publicity, or ticket sales.
It really is a disgrace.