Some people clearly missed the point of this show. It is a PARODY.
Jesus Christ, obviously the different writing on the daughter's grave is not a mistake, it's in purpose! They would have to change the gravestone.
The whole show is full of delicious nods to the tropes used in the books that it's making fun of.
Saying "bingo" when finding a ridiculous hint that no one would leave.
Comically large and full wine glass. Too long pauses during awkward situations. It's all on purpose. If you go in not understanding it's a parody - which the title should clue you in - then you will be disappointed.
Otherwise, it was great. I loved it.