The Stage Plays
- Hostility on the Set: Walter Matthau did not get along with Mike Nichols (who was quoted as saying "Art Carney was a saint, Walter Matthau was not a nice man") and the two never worked together again.
- What Could Have Been: Originally the debut stage production of the female version of the play was going to star Nancy Walker and Joan Rivers, and be directed by Neil Simon himself. It ended up starring Rita Moreno (who was replaced with Brenda Vaccaro later in the Broadway run) and Sally Struthers, with Gene Saks directing the production.
- Write Who You Know: Neil Simon based Felix on his older brother, Danny Simon.
