As previously reported, Nat Faxon and Jim Rash's comedic drama will also feature theater veterans Toni Collette and Sam Rockwell. The film centers on a teenager (played by Liam James) and his unlikely friendship with a local water-park manager (Rockwell). Additional cast members include Steve Carell, Rob Corddry, and Maya Rudolph.
Peet's theater credits include Barefoot in the Park on Broadway and The Break of Noon Off-Broadway. Her television and film credits include Bent, Studio 60 on the Sunset Strip, Please Give, A Lot Like Love, and Something's Gotta Give.