Slate.

Gwen Hillier plays casting director Helen Mankowicz. In the waiting room scene, there's a poster for 'One More' (2017), the film that Gwen cast in real life. The poster is also an easter egg for P 1 2 3 / So Za fans, as this was the last film that Sophia Zach and Nate Hapke collaborated on before making 'Slate.' (2018).