- She started out acting in theatre, appearing in a Broadway production of Annie when she was 11.
- She portrayed a young Queen Elizabeth II in the Broadway show The Audience. The elder queen was played by Helen Mirren.
- Grew up a fan of Seinfeld (1989), often watching rerun episodes. She feels that the character of Elaine Benes - the lone female in an otherwise male primary cast - prepared her for her own star-making turn as Max Mayfield on Stranger Things (2016).
- Sadie became vegan after working with Woody Harrelson in the movie The Glass Castle (2017).
- For her role as Max Mayfield in Stranger Things, she trained in skateboarding for two months, taking three hour lessons daily, to learn the basics.
- She met her Stranger Things co-stars Gaten Matarazzo and Caleb Mclaughlin before they were in Stranger Things because all three starred in Broadway around the same time in different shows.
- Older sister of Jacey Sink.
- Close friends with Stranger Things (2016) co star Maya Hawke.
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