Features a rare, uncredited acting appearance by legendary men's hairstylist Jay Sebring, cast as (in an atrocious pun on his name) Mr. Oceanbring. Less than three years later, he would be brutally murdered, along with his former fiancée, Sharon Tate, and three other people, by members of the Charles Manson "family."
At the British embassy, the butler's name appears to be Rhett.
Steve Allen plays Talk Show host "Allan Stevens", a play on his own name. In earlier versions of the script, the character was named "Connie Jarson", a female version of Johnny Carson.
In his scene with Batman, Belton Bellgoody recounts his childhood in Youngstown Ohio. Joe Flynn, the actor playing Bellgoody, was from Youngstown and grew up in similar conditions as described by Bellgoody. A true example of life imitating art.
Maurice Dallimore had earlier played an uncredited role as the British United World Delegate in the 1966 Batman Movie, and would later play Superintendent Watson in the Londonium episodes.