- Michael Stuhlbarg as Lawrence "Larry" Gopnik
- Richard Kind as Arthur Gopnik
- Fred Melamed as Sy Ableman
- Sari Lennick as Judith Gopnik
- Aaron Wolff as Danny Gopnik
- Jessica McManus as Sarah Gopnik
- Alan Mandell as Rabbi Marshak
- Adam Arkin as Don Milgram
- George Wyner as Rabbi Nachtner
- Amy Landecker as Mrs. Vivienne Samsky
- Peter Breitmayer as Mr. Brandt
- Brent Braunschweig as Mitch Brandt
- Katherine Borowitz as Mimi Nudell
- Allen Lewis Rickman as Velvel
- Yelena Shmulenson as Dora
- Fyvush Finkel as Dybbuk?
- Simon Helberg as Rabbi Scott Ginsler
- Raye Birk as Dr. Shapiro
- Michael Lerner as Solomon Schlutz
- David Kang as Clive
- Steve Park as Clive's father
- Ari Hoptman as Arlen Finkle
- Amanda Day as Art Student
- Landyn Banx as Actor
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