A tale I heard
Big Little Lies casting director, David Rubin, on getting Meryl Streep to appear in Series 2:
"The development of the second season was prompted by the novelist, Liane Moriarty, who had an idea for furthering the story and wrote a novella that encompassed the second season story she proposed we tell. In the novella she named the character of Perry’s mother Mary Louise — and Mary Louise is Meryl Streep’s given name. Though I believe we all would have said Meryl Streep upon reading the novella, I think Liane Moriarty was the first person to plant that seed."