At 39'35" the lenses of a camera are visible on the right before reversing out.
At 21:48 after Steed ordered cuts of meat from a butcher Mrs. Gale tells Steed, "But you can't cook." However, in the episode "Death Ala Carte," Steed poses as a chef and makes Beef Bourguignon and a pheasant dish, proving that he is an expert cook.
At around 11:53, Mrs Gale states that the M1 is a motorway going 'from London to Birmingham', but the M1 goes to Leeds; at the time of production, no motorway connected London and Birmingham, later in the decade, the M6 would be completed, connecting the M1 to Birmingham and the north west.