Problems that I think kept the lid on this Nanette: the performance style needs to heightened, which is something that Burt Shevelove must have brought to his original direction. You can hear some of the style of it in the dialogue bits on the Original Broadway Cast Recording, in the Finalettos. It's nonsense played like everything is a matter of life or death. Listen to Roger Rathburn's slightly stilted delivery of "That's a LIE! I mean that's NOT a lie!" or Ruby Keeler's melodramatic, "Why should you get an anonymous letter, or... overhear it in a powder room?" While it wasn't played straight at Encores, if the performance doesn't have a "can you believe this?" wink to it, it sits like lead.
Second thing is that while the orchestra technically played well and the orchestrations sounded as great as ever, I think the orchestra never went over the top to pure abandon. The playing was a bit reserved.
As I indicated above, I still enjoyed myself, but believe the show can make an even stronger impression when everything about it is set to 11.
Begin at the beginning and go on till you come to the end: then stop.