Benning

I thought the same thing. It was as if the role was written for Keaton, with her manner of speaking, and Benning did it with the same readings Keaton would have done.

Agreed. When I first caught this film on Netflix I thought it was Keaton (Pacino and Keaton together again:-)

Thats what I thought even before I read this post. I really like Annette Benning's acting.
All the resemblance of Diane Keaton was very distracting. I appreciate everyone has their favourites but for some reason I find her deplorable. If this was something planned in pre-production stages I find it very untasteful.

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The two of them don't look anything alike.