The Cast For "Glass Onion: A Knives Out Mystery" Is Stacked

Henwick plays Peg, Birdie's harried assistant. The actor told Entertainment Weekly in November that she based her part on her own experiences as a harried Hollywood production assistant. "I've been a P.A., so I knew what it was like," she said. "I quit. I walked off. I was like, I'm done.'"

"I tried to capture that feeling that I had that day," she explained of her work in the film. "That's how Peg feels every single day. Just right on the verge of quitting. 'Why am I doing this?' But also she just can't get out of it, because she loves and is reliant on Birdie. It's a very interesting, fascinating relationship. Super co-dependent. We don't get to see women in this relationship very often on screen."