Trivia: Because Erin Murphy, who played Tabitha, was ill, her fraternal twin sister Diane took her place in this episode. By this time, Erin and Diane didn't resemble each other as much as they once did, and it was obvious to regular viewers of the show that it wasn't the Tabitha they were used to seeing. The producers received several letters asking "Who was that?"
Trivia: "The Man From U.N.C.L.E.'s" original working title was "Solo," and its lead character was named for a spy with a minor role in one of Ian Fleming's early Bond novels. U.N.C.L.E. producer Norman Felton had a handshake agreement with Fleming to use the name and to develop "Solo" as a TV spy series. But the Bond film franchise had other ideas, reneged on the agreement on Fleming's behalf, and sued, forcing the title change. Felton prevailed only in retaining the character's name: Napoleon Solo.