Martin and Tim enter CRUSH Headquarters via telephone booth, much like Maxwell Smart entered CONTROL in Get Smart.
Mrs. Brown's brother, Alvin, is played by a young Gavin MacLeod, who went on to appear as Murray Slaughter in "The Mary Tyler Moore Show", and later to star as the Captain of "The Love Boat".
The title is based on the panel game show I've Got a Secret (1952) originally hosted by Garry Moore.
Gavin MacLeod is billed McLeod.
Mrs Brown's maiden name was Wanamaker since that is her baby brothers name.