Briney, 27, said that being back on set felt like "trial by fire where Iβm like, 'I don't think I'm good at this anymore. I don't know if I ever was'"
Banks tells PEOPLE she "had reliable sourcing" that working on 'The Better Sister' with Biel "would be easy" as she's only "heard the loveliest things" about her
Seth Rogen's costars Ike Barinholtz, Kathryn Hahn, Catherine O'Hara and Chase Sui Wonders didn't even know about the voiceover until PEOPLE's interview
Poehler called the spinoff a "small inside joke onset laugh" that "grew into a beast that is still discussed today" as she premiered the trailer on her podcast