I thought the final reveal of the sister was cheap. I get why they did it, but in a play that was totally unexpected at every turn, that turn was expected.
I also question the decision of having such a meaty scene near the end, a scene that really explains the play, happen on screen. In many ways this play felt akin to White Girl In Danger for me - stage works that play around with screen conventions trying to create the feel of a series/miniseries/epic film on stage. This production went to great lengths to play with stage vs screen conventions, to question if the two could be meaningfully melded. And then when it came down to brass tacks and time to explain the piece, they abandoned the stage and fully went screen. I get why - Dianne Wiest gives a fantastic performance but does come off better on screen than on stage. But it still felt like a sort of cop out.