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After a read-through of the first six episodes, the producers thought that original Angie Watts actress Jean Fennell was not quite working in the role.

The read-through ends around 8 p.m.

It was only at the read-through that everyone learned Grace Penn was president of the United States.

O'Carroll, who is also the show's creator, said he had made a "clumsy attempt at a joke" during a read-through of the scripts, where he was in character as Agnes Brown.

“Even back when we were doing a read-through, I could tell that she got the subtlety of the lines and the different meanings. And what she can do with her face! For her to return again and again to what are quite emotional moments was just incredibly impressive in terms of her stamina and commitment.”