Barbara Harris's film debut.
The original Broadway production of "A Thousand Clowns" by Herb Gardner opened at the Eugene O'Neill Theater in New York on April 5, 1962, ran for 428 performances and was nominated for the 1963 Tony Award for Best Play. Jason Robards, Gene Saks, William Daniels and Barry Gordon recreated their stage roles in the filmed production. Barry Gordon (I)' was nominated for the 1963 Tony Award for Best Featured Actor in a Play. Sandy Dennis who did not recreate her stage role, won the 1963 Tony Award for Best Featured Actress in a Play.
This movie features a scene where Jason Robards walks in front of the Lincoln Center for the Performing Arts during its construction.