The village where season six, episode seven, "Murdersville", was filmed, was also used for a part of The Dirty Dozen (1967).
Mrs. Peel, we're needed.
Steed was an officer during World War Two, but episodes involving his past disagree as to whether he served in the Army or the Royal Air Force.
American broadcasts of the 1965 season were preceded by an introduction showing Emma Peel and John Steed walking across a giant chessboard as a narrator says: "Extraordinary crimes against the people and the state have to be avenged by agents extraordinary. Two such people are John Steed -- top professional, and his partner, Emma Peel -- talented amateur. Together they are -- The Avengers!"
In the United States during the 1970's, some fourth season syndication prints lacked the chessboard sequence before the title and some fifth and sixth season episodes lacked the champagne bottle sequence before the title.